FDC37B77X SMSC Corporation, FDC37B77X Datasheet - Page 17

• Manufacturer Part Number: FDC37B77X
• Description: ENHANCED SUPER I/O CONTROLLER WITH WAKE UP FEATURES
• Manufacturer: SMSC Corporation

PS/2 Model 30 Mode
BIT 0 nDRIVE SELECT 2
The DS2 disk interface is not supported in the
FDC37B77x.
BIT 1 nDRIVE SELECT 3
The DS3 disk interface is not supported in the
FDC37B77x.
BIT 2 WRITE GATE
Active high status of the latched WGATE output
signal. This bit is latched by the active going
edge of WGATE and is cleared by the read of
the DIR register.
BIT 3 READ DATA
Active high status of the latched RDATA output
signal. This bit is latched by the inactive going
edge of RDATA and is cleared by the read of the
DIR register.
RESET
COND.
nDRV2
N/A
7
nDS1
6
1
nDS0
5
1
WDATA
F/F
4
0
17
BIT 4 WRITE DATA
Active high status of the latched WDATA output
signal. This bit is latched by the inactive going
edge of WDATA and is cleared by the read of
the DIR register.
WGATE.
BIT 5 nDRIVE SELECT 0
Active low status of the DS0 disk interface
output.
BIT 6 nDRIVE SELECT 1
Active low status of the DS1 disk interface
output.
BIT 7 nDRV2
Active low status of the DRV2 disk interface
input. Note: This function is not supported in
the FDC37B77x.
RDATA
F/F
3
0
WGATE
F/F
2
0
This bit is not gated with
nDS3
1
1
nDS2
0
1