User guide

This read-only register contains information relating to module revision, CPU
speed, and SCSI options. The information read from this register is hardwired
on the module and is unaffected by resets. A write of 1 to bit 0 of this register
clears the Periodic Real-Time timer. Figure 9–5 shows the module configuration
register.
Figure 9–5 Module Configuration Register
31 08 07 06 05 04 03 02 01 00
ML013288
Reserved
CPU ID
Don't Care
MOD_CONFIG_REG :
Module ID
Debug Mode
Reserved
Table 9–2 Module Configuration Register
Field Name Type Description
<1:0> Reserved
<2> Debug RO If 0, the SROM starts the mini-debugger. If 1, the SROM
starts the console.
<4:3> Module ID RO Identifies the I/O module that is installed according to the
following definitions:
<4:3> Module
00 Type I
01 Type II
10 Reserved
11 Reserved
(continued on next page)
Nbus 9–7