Created attachment 609 [details] Trace from Wonderswan Color talking to its internal EEPROM. One capture for each command I saw The WonderSwan console was released by Bandai in 1999, and includes a peculiar hardware-assisted microwire interface. It always sends commands that are 34 bits long, and has padding at the beginning and end of each command, relying on the 93xx EEPROM to not care about 0s sent at after CS goes high, or extra clocks at the end. I'm not certain what's the right way to fix this; as I understand it different endpoints have different framing requirements. (For example, NatSemi has AN-452 / TI# SNOA743 that mentions five different Microwire peripherals, only one of which is the 93xx EEPROM, and the other four do not tolerate any padding at the beginning of the frame). It may well be academic until such time as we find a peripheral that uses a COP430 or COP472. The attachment includes five traces: three between the WonderSwan Color SOC and the on-mainboard EEPROM, and two between the 2001 peripheral used on WonderSwan game cartridges and the on-cartridge EEPROM. The exact timing on the 2001 peripheral is subtly different (it can transfer varying numbers of bits) but it still relies on this leading padding. If you want more captures just let me know.
This is related to https://sigrok.org/bugzilla/show_bug.cgi?id=1654 , and I've seen the same thing on two other devices - one using an older 93C66 part, the other a more recent atmel AT93C66. Some variants (older NMC93C66 at least, possibly others) seem to want an extra clock pulse before the actual startbit - presumably to "clock in" the chip-select signal. This is shown in the old datasheets only, but it looks like newer ICs (e.g. AT93C66) also tolerate this, and probably wait for a startbit==1 condition. The eeprom93xx PD on the other hand, just takes the first clock pulse as the startbit, which probably causes what you're seeing here. I'm not sure what the best way to fix this would be; I have a digusting patch that worked for my capture : https://github.com/fenugrec/libsigrokdecode-tmp/commit/399be365aa725b9bf78886cc2847b8f5918c9149 but it's definitely not a proper generic fix.
Created attachment 775 [details] Comparison of old and new 93C66 datasheets These show the READ command diagram, from a NMC93C66 datsheet and a recent AT93C66. Note the extra pulse before the actual start bit and opcode.
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