Expansion rom base address, Subsystem id (ssid), 0x30 – Avago Technologies LSI8751D User Manual
Page 85: Register: 0x2e, Register: 0x30
Configuration Registers
3-21
Register: 0x2E
Subsystem ID (SSID)
Read Only
SSID
Subsystem ID
[15:0]
This register supports subsystem identification, which has
a default value of 0x0000 in the LSI53C875 and 0x1000
in the LSI53C875E (see
Section 4.1, “MAD Bus Program-
). To write to this register, connect a 4.7 k
Ω
resistor
between the MAD[6] pin and V
ss
and leave the MAD[4]
pin unconnected. The MAD[6] and MAD[4] pins have
internal pull-up resistors and are sensed shortly after the
deassertion of chip reset. In revisions before Revision G
of the LSI53C875, the MAD[6] and MAD[4] pins do not
support the SSID and SSVID configurations, and only
values of 0x0000 can be found in the Subsystem Data
register.
Register: 0x30
Expansion ROM Base Address
Read/Write
ERBA
Expansion ROM Base Address
[31:0]
This four-byte register handles the base address and size
information for expansion ROM. It functions exactly like
the
and
registers, except that the encoding of the bits
is different. The upper 21 bits correspond to the upper
21 bits of the expansion ROM base address.
15
0
SSID
LSI53C875E
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
LSI53C875
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
31
0
ERBA
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0