
Agere Systems Inc.
99
Data Sheet
May 2001
and Packet Payload Engine
Ambassador T8110 PCI-Based H.100/H.110 Switch
9 General-Purpose I/O
(continued)
9.1.2 GPIO Read Mask Register
The GPIO read mask register controls the masking of any GP signals being used as general-purpose register bits
on a read access to the GPIO register.
9.1.3 GPIO R/W Register
The GPIO R/W register provides direction control for any of the GP signals being used as general-purpose register
bits.
Table 77. GPIO Read Mask Register
Byte Address
0x00501
Name
Bit(s)
7
Mnemonic
G7MEB
Value
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Function
GPIO Read Mask
Unmask GPIO bit 7 (default).
Mask GPIO bit 7, return 0 on a read.
Unmask GPIO bit 6 (default).
Mask GPIO bit 6, return 0 on a read.
Unmask GPIO bit 5 (default).
Mask GPIO bit 5, return 0 on a read.
Unmask GPIO bit 4 (default).
Mask GPIO bit 4, return 0 on a read.
Unmask GPIO bit 3 (default).
Mask GPIO bit 3, return 0 on a read.
Unmask GPIO bit 2 (default).
Mask GPIO bit 2, return 0 on a read.
Unmask GPIO bit 1 (default).
Mask GPIO bit 1, return 0 on a read.
Unmask GPIO bit 0 (default).
Mask GPIO bit 0, return 0 on a read.
6
G6MEB
5
G5MEB
4
G4MEB
3
G3MEB
2
G2MEB
1
G1MEB
0
G0MEB
Table 78. GPIO R/W Register
Byte Address
0x00502
Name
Bit(s)
7
Mnemonic
G7DSB
Value
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Function
GPIO R/W
GPIO bit 7 direction is input (default).
GPIO bit 7 direction is output.
GPIO bit 6 direction is input (default).
GPIO bit 6 direction is output.
GPIO bit 5 direction is input (default).
GPIO bit 5 direction is output.
GPIO bit 4 direction is input (default).
GPIO bit 4 direction is output.
GPIO bit 3 direction is input (default).
GPIO bit 3 direction is output.
GPIO bit 2 direction is input (default).
GPIO bit 2 direction is output.
GPIO bit 1 direction is input (default).
GPIO bit 1 direction is output.
GPIO bit 0 direction is input (default).
GPIO bit 0 direction is output.
6
G6DSB
5
G5DSB
4
G4DSB
3
G3DSB
2
G2DSB
1
G1DSB
0
G0DSB