Toshiba TMPR7901, User Manual

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Chapter 7: C790 Bus/G-Bus Bridge
TX7901 User’s Manual (Rev. 6.30T – Nov, 2001)
7-22
7.6.25 G-Bus Bad Address Register
The Bad Address register reports the G-Bus address when there is bus error on the G-Bus
and the G-Bus bridge is writing to the device on the G-bus. This register can only be set
when the ERR bit in the Status register is “0”. Note that the first error is held in case multiple
errors occur.
63 32
0
32
31 0
ERR
32
Table 7-27 C790 Bus Status Register Fields
Bits Field R/W Description Initial Value
63:32 – R/O
Reserved. Must be written as zeroes,
and returns zeroes when read.
0
31:0 ERR R/O Bad G-Bus Address Undefined
7.6.26 G-Bus Arbiter Request Status Register
This register indicates which G-master is requesting the G-Bus.
63 32
0
32
31 16 15 0
0 Req[15:0]
16 16
Table 7-28 G-Bus Arbiter Request Status Register Fields
Bits Field R/W Description Initial Value
63:16 – R/O
Reserved. Must be written as zeroes, and
returns zeroes when read.
0x0000
15:0 Req[15:0] R/O
G-Bus Request
0: Request
1: No request
Undefined