Interrupt pin, Min_gnt, Register: 0x3d – Avago Technologies LSI53C876E User Manual
Page 109: Register: 0x3e
PCI Configuration Registers
4-15
Register: 0x3D
Interrupt Pin
Read Only
IP
Interrupt Pin
[7:0]
This register is unique to each SCSI function. It tells
which interrupt pin the device uses. Its value is set to
0x01 for the Function A INTA/ signal, and 0x02 for the
Function B INTB/ signal at power-up. The Function B
INTB/ value is set to 0x01 if MAD[4] is pulled low.
Register: 0x3E
Min_Gnt
Read Only
MG
Min_Gnt
[7:0]
This register specifies the desired settings for latency
timer values. Min_Gnt specifies how long a burst period
the device needs. The value specified in these registers
is in units of 0.25 microseconds. The LSI53C876 SCSI
function sets this register to 0x11.
7
0
IP
SCSI Function A
0
0
0
0
0
0
0
1
SCSI Function B if MAD[4] pulled low
0
0
0
0
0
0
0
1
SCSI Function B if MAD[4] not pulled low
0
0
0
0
0
0
1
0
7
0
MG
0
0
0
1
0
0
0
1