CL-PD6833 Datasheet, PDF (161/216 Pages) Cirrus Logic – PCI-to-CardBus Host Adapter

CL-PD6833
PCI-to-CardBus Host Adapter
11.9.3 Device Capability Byte A
Register Name: Device Capability Byte A
I/O Index: 36h
Memory Offset: 936h
Bit 23
Bit 22
Bit 21
Bit 20
Bit 19
Register Per: chip
Register Compatibility Type: ext.
Bit 18
Bit 17
Bit 16
Per-Socket
LED
RFU
GPSTB
Capable
RFU
Slave DMA IDE Interface # Sockets 1 # Sockets 0
R:1
R:0
R:0
R:0
R:1
R:0
R:0
R:1
Bits 17:16 — # Sockets [1:0] (Number of Sockets Supportable by Device)
This bit field indicates how many sockets a device is capable of supporting, expressed as the
highest socket index number supportable, for example ‘00’ indicates only socket 0 is supportable,
meaning a single socket device, and ‘11’ indicates sockets 3 through 0 are supportable, indicating
a four-socket capable device.
Bit 18 — IDE Interface
A value of ‘0’ indicates that the CL-PD6833 does not support driving an external IDE drive.
Bit 19 — Slave DMA
A ‘1’ at this bit indicates that the CL-PD6833 can act as a DMA slave. The Slave DMA Wired bit
(bit 2 of the Device Implementation Byte A register; see page 163) indicates whether a system
is wired to allow this feature to be used.
Bit 20 — RFU (reserved for future use)
Bit 21 — GPSTB Capable
A value of ‘0’ in this field indicates that the CL-PD6833 does not support general-purpose strobe.
Bit 22 — RFU (reserved for future use)
Bit 23 — Per-Socket LED
If this bit is set to ‘1’, the device is capable of supporting independent LEDs on each socket.
If this bit is set to ‘1’, it is intended that Socket Services would check bits 16 and 17 of the Device
Implementation Byte C register (see page 165) to determine if per-socket LEDs are supported in
the system implementation. The description of bits 16 and 17 explains the software implications if
per-socket LED support is to be enabled.
June 1998
ADVANCE DATA BOOK v0.3
EXTENSION REGISTERS
161