Stefan Richter <stefanr@s5r6.in-berlin.de> writes:
Both VT6306 and VT6307 datasheets claim selectable OHCI 1.0/1.1.
I guess they did that for compatibility or something like that.
The 6307 chip allows for either I^2C (24c01 etc) or 93c64 EEPROM (there
is a pin to select), while 6306 works with 93c64 only (4-wire: chip
select, clock, data-in, data-out).
I examined 3 machines with VT6307 using a simple home-made signal
analyzer:
a) using 93C46 EEPROM and OHCI 1.0
b) using 24C01A EEPROM and OHCI 1.0
c) using 24C01A EEPROM and OHCI 1.1
All 3 chips have PCI vendorID 1106 and deviceID 3044, revision is 0x80.
The VT6307 chip reads the EEPROM (after reset) in the following order:
ADDR ADDR a) b) c)
4-wire I^2C
A 14 subsystem vendor ID
B 16 subsystem device ID
10 20 103C 103C 103C values same on all machines
C 18 DF03 DF03 DF03
D 1A 8040 8040 8040
E 1C 2000 2000 2000
F 1E 7300 7300 7300
11 22 0000 0000 0008
12 24 0000 0000 0000
0 0 4000 0000 1000 config_rom: offset 0E
1 2 0063 DC10 00DC (GUID) 0C
2 4 0100 FD00 0101 12
3 6 D0D4 8F75 F2D4 10
4 8 0404 0404 0404 values same on all machines
5 A 5532 5532 5532
6 C 00F8 00F8 00F8
7 E 02A2 02A2 02A2
8 10 00A1 00A1 00A1
9 12 6340 6340 6340
The only difference (not counting GUID) is at address 0x11 (0x22
for I2C).
I haven't yet checked if it changes OHCI version - I of course
could program the EEPROM externally but I think I'd better find
how to do that from PCI side.
--
Krzysztof Halasa
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