CD2231 Intel Corporation, CD2231 Datasheet - Page 88

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CD2231

Manufacturer Part Number
CD2231
Description
CD2231 Intelligent Two-channel Lan And Wan Communications Controller
Manufacturer
Intel Corporation
Datasheet
CD2231 — Intelligent Two-Channel LAN and WAN Communications Controller
8.0
8.1
8.1.1
8.1.2
88
Register Name: GFRCR
Register Description: Global Firmware Revision Code
Default Value: x’0D
Access: Byte Read/Write
Register Name: CAR
Register Description: Channel Access
Default Value: x’03
Access: Byte Read/Write
Bit 7
Bit 7
0
Detailed Register Descriptions
Global Registers
Global Firmware Revision Code Register (GFRCR)
This register serves two functions in providing the host with information about the CD2231. When
a hardware RESET* signal, or a software RESET ALL command is issued through either of the
two Channel Command registers, it initializes the CD2231 and zeroes this register at the start of the
initialization. At the end of the initialization, the CD2231 writes its firmware revision code to the
GFRCR. All valid CD2231 revision codes are non-zero and the revision code is incremented by
one with each new release (for example, GFRCR for Revision D = 34 hex).
Host software must confirm that the GFRCR contents are non-zero before proceeding to configure
the CD2231 for normal operation.
Channel Access Register (CAR)
This register contains the channel number for the channel-oriented host read or write operations
when the host is not in an interrupt service routine. The CD2231 supplies the interrupting channel
number during all interrupt service operations. The Channel Access register contents are not used
during an interrupt service. Note that this means that an interrupt service routine is restricted to
accessing only the register set of the Interrupting Channel and Global registers.
Bits 7:1
Bit 0
Bit 6
Bit 6
0
Reserved – must be ‘0’.
Channel number
Bit 5
Bit 5
0
Firmware revision code
Bit 4
Bit 4
0
Bit 3
Bit 3
0
Bit 2
Bit 2
0
Motorola Hex Address: x’EE
Motorola Hex Address: x’81
Bit 1
Bit 1
Intel Hex Address: x’EC
0
Intel Hex Address: x’82
Datasheet
Bit 0
Bit 0
C0

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