#garfield Logs
Nov 17 2020
#garfield Calendar
02:36 AM aandrew is now known as Guest20191
07:28 AM rue_bed: so, if I go by the book, from a state machine I should go to pushdown automation
07:48 AM Guest20191 is now known as aandrew
08:10 AM polprog: hmm, i could use a 555 timer as a resistor
08:10 AM polprog: theres 4k3 (5k nom) between 5 and 8, and 12k between 1 and 8
08:11 AM polprog: i bet that is not in the 555 cookbook
08:17 AM rue_mohr: hahah
08:22 AM polprog: now if i found some repetitive capacitance between to pins, we could make an RC oscillator with nothing but 555s
08:39 AM rue_mohr: I'v been wondering if there is a way to dispose of the resistor
10:48 AM rue_mohr: ok I got 96% on that exam
10:48 AM rue_mohr: apparently missed two questions, not sure what...
10:52 AM polprog: thats a damn good result :)
11:00 AM rue_mohr: I was usre I'd be 100
11:00 AM rue_mohr: I bet I did a mixup on the terminology matchup
11:54 AM rue_mohr: aandrew, interesting
11:55 AM rue_mohr: that 2000 solved book?
11:55 AM rue_mohr: some of the diagrams are from another book I have
12:34 PM rue_mohr: awe, I was kinda hoping for more exotic material from that book
12:47 PM Tom_L: get your quadrature worked right?
12:50 PM rue_mohr: yea it worked
12:50 PM rue_mohr: 6 bit quadrature decoded
01:04 PM rue_mohr: polprog, I cant find a BGA ROM that would fit in a 0.3" dip carrier
01:04 PM rue_mohr: or any
01:04 PM polprog: i doubt they made BGA ROMs, unless flash
01:04 PM polprog: and..
01:04 PM polprog: hmm wait
01:04 PM polprog: theres a very narrow and long flash SMD package
01:04 PM rue_mohr: dont care about what tech it is
01:05 PM rue_mohr: has to be parallel interface
01:05 PM polprog: https://www.eliptor.pl/galerie/p/pamiec-flash-29f010-z-adaptere_2001.jpg
01:05 PM polprog: this, but narrow dip?
01:05 PM rue_mohr: K4B2G1646Q
01:05 PM rue_mohr: ?
01:05 PM polprog: ddr sram
01:05 PM polprog: ddr3 even
01:06 PM rue_mohr: drat
01:06 PM polprog: SDRAM
01:06 PM polprog: hmm, not really what we can use
01:06 PM rue_mohr: damn you aliexpress
01:06 PM polprog: 29f010 in that fancy package looks promising
01:06 PM polprog: it would have to be double sided board
01:06 PM rue_mohr: freaking windstorm
01:06 PM polprog: to fit a narrow dip
01:06 PM rue_mohr: this afternoons class is backup power systems
01:07 PM rue_mohr: and I'm gonna have an outage right as it starts
01:09 PM rue_mohr: not sure if not durviving the outage means I fail the backup power systems class
01:09 PM Tom_L: how fitting
01:09 PM rue_mohr: I should go put the tent back, its comming apart
01:10 PM rue_mohr: polprog, I cant find it in bga
01:10 PM rue_mohr: https://www.aliexpress.com/item/4000117034070.html
01:11 PM Tom_L: wonder why those packages are wide and short
01:12 PM Tom_L: i doubt they need to be
01:13 PM rue_mohr: yea
01:13 PM rue_mohr: and I cant find bga
01:13 PM Tom_L: you _want_ bga?
01:14 PM polprog: i dont think they make them in bga
01:15 PM polprog: the smallest package is that narrow soic
01:15 PM Tom_L: no quad flat pack?
01:15 PM Tom_L: leadless
01:15 PM Tom_L: i forget what those are called
01:15 PM polprog: i didnt see any
01:15 PM polprog: it would be listed in the datasheet
01:16 PM rue_mohr: I KNOW there are parallel roms in small bga packages
01:16 PM rue_mohr: so... where are they?
01:17 PM Tom_L: https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwivnZeRpYrtAhVKC6wKHc5HBUYQFjAAegQIBxAC&url=https%3A%2F%2Fmedia-www.micron.com%2F-%2Fmedia%2Fclient%2Fglobal%2Fdocuments%2Fproducts%2Fdata-sheet%2Fnor-flash%2Fparallel%2Fm29ew%2Fm29ew_32mb_128mb.pdf%3Frev%3D7b0ad383b8494d3b844e9bf8e116bf56&usg=AOvVaw0gr_0dsOqqXWY9JRYawbF-
01:17 PM polprog: ok, bga
01:18 PM Tom_L: 48 bga
01:18 PM rue_mohr: 28F032
01:18 PM polprog: PZ28F032
01:18 PM polprog: PZ is BGA
01:19 PM rue_mohr: ali's substring matching sucks
01:20 PM polprog: farnell doesnt have them
01:20 PM polprog: weird
01:21 PM rue_mohr: xx wont be part of the number
01:21 PM rue_mohr: thats'll be the speed postfix
01:21 PM rue_mohr: er sumthin
01:21 PM polprog: yeah, but PZ28F032 does not return anything
01:22 PM rue_mohr: cant get any hits on ali
01:22 PM rue_mohr: shall we ask micron for free samples?
01:23 PM polprog: :) good idea..
01:23 PM rue_mohr: whoa
01:23 PM rue_mohr: tom
01:23 PM rue_mohr: the ONLY hits google has are the datasheets
01:23 PM rue_mohr: I dont think these were ever actually made
01:25 PM polprog: all 7 hits for BGA 48 paralell flash on farnell are either no longer stocked or special order...
01:25 PM polprog: what the hell
01:27 PM polprog: https://www.newark.com/cypress-semiconductor/s29gl128p10ffi020/flash-memory-128mbit-40-to-85deg/dp/99AC4460?st=s29gl128
01:32 PM rue_mohr: I'm wondering if I have anything I can scavenge some from
01:32 PM rue_mohr: it would have to be small and a bit old
01:32 PM polprog: and they can backorder in jan closest
01:32 PM polprog: rue_mohr: pagers!
01:32 PM polprog: and mobile brickphones
01:33 PM rue_mohr: yes
01:33 PM polprog: these will have that for sure
01:33 PM rue_mohr: have to be *just* the right age tho
01:33 PM polprog: yeah, id say 1995-ish
01:33 PM rue_mohr: bit later for bga
01:33 PM rue_mohr: I think
01:33 PM rue_mohr: but too far and the memory would be integrated
01:34 PM rue_mohr: oh wait, I threw out that blackberry motherboard
01:34 PM rue_mohr: I wonder if its still in the bin
01:41 PM rue_mohr: https://blog.oshpark.com/tag/bga/
01:41 PM rue_mohr: winbond
01:43 PM rue_mohr: W9825G6CB
01:43 PM polprog: i wonder if my local pcb maker does BGA
01:44 PM polprog: grrr i still have the lora project unfinished
01:45 PM rue_mohr: lets say 1M
01:45 PM rue_mohr: x16?
01:45 PM rue_mohr: no, let me think
01:45 PM rue_mohr: go greedy, 16bitsx16bits
01:46 PM rue_mohr: yea 1M
01:46 PM rue_mohr: ok! cant go that low
01:46 PM rue_mohr: starts at 32M
01:47 PM rue_mohr: all discontinued
01:47 PM rue_mohr: but
01:47 PM rue_mohr: W29GL032
01:49 PM rue_mohr: well those aren't available from china
01:49 PM rue_mohr: but
01:49 PM rue_mohr: 25Q128 is
01:50 PM polprog: that's spi
01:51 PM rue_mohr: ARG
01:55 PM rue_mohr: W29GL512SH9B
01:55 PM rue_mohr: is availabale from dk...
01:55 PM rue_mohr: not from ali
01:57 PM rue_mohr: heh 2G
01:57 PM rue_mohr: 256M*8
01:58 PM rue_mohr: oh that sucks
01:58 PM rue_mohr: ALE
01:58 PM rue_mohr: the bus is mulipliexed
01:59 PM rue_mohr: and it must be packet based
01:59 PM rue_mohr: 5 cycles to get the address into it
02:00 PM rue_mohr: class!
04:08 PM rue_mohr: yaya I learned all about batteries today
04:09 PM rue_mohr: ----|i-----|i---- <--- parallel connected batteries! :P
04:09 PM rue_mohr: if each is 5Ah, the total capacity is 30Ah!
04:09 PM rue_mohr: (I had some words with the instructor about the interactive tutorial he sent us to)
04:14 PM Tom_L: did he take it well?
04:15 PM Tom_L: uhh, that's series dude
04:15 PM rue_mohr: yup
04:15 PM rue_mohr: not according to the interative tutorial
04:15 PM Tom_L: and it would still be 5Ah
04:15 PM rue_mohr: so answer the test questions right!
04:15 PM rue_mohr: not according to the interative tutorial
04:15 PM rue_mohr: so answer the test questions right!
04:15 PM rue_mohr: :)
04:41 PM polprog: haha
04:41 PM polprog: reminds me of capacitor problems in high school
06:37 PM rue_mohr: heh, did they get it wrong?
10:26 PM rue_mohr: if my fsm becomes a computer, does that means I'v gone full circle
10:54 PM rue_mohr: well I need to do a 16 bit fsm
10:54 PM rue_mohr: it looks like 16 bits is enough to do a small computer