CD2231 Intel Corporation, CD2231 Datasheet - Page 147

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CD2231

Manufacturer Part Number
CD2231
Description
CD2231 Intelligent Two-channel Lan And Wan Communications Controller
Manufacturer
Intel Corporation
Datasheet
8.6.5.5
8.6.5.6
8.6.5.7
Datasheet
Register Name: ATBCNT
Register Description: Transmit Buffer ‘A’ Byte Count
Default Value: x’0000
Access: Word Read/Write
Register Name: BTBCNT
Register Description: Transmit Buffer ‘B’ Byte Count
Default Value: x’0000
Access: Word Read/Write
Register Name: ATBSTS
Register Description: Transmit Buffer ‘A’ Status
Default Value: x’00
Access: Byte Read/Write
Bit 15
Bit 15
Bit 7
Bit 7
Bit 7
Berr
A Buffer Transmit Byte Count (ATBCNT)
B Buffer Transmit Byte Count (BTBCNT)
These registers contain the count of the bytes in the buffers to be transmitted.
A Transmit Buffer Status (ATBSTS) — Async-HDLC/PPP Mode
Setting the Append bit allows data to be added to the buffer after transmission has begun. In this
mode, the host sets ATADR and ATCNT as normal, but when new data is appended to the buffer,
the ATBCNT/BTBCNT (Transmit Buffer Count) can be updated. When the A buffer is used in
Append mode, the CD2231 does not set the EOB bit. When the host has completed use of the
buffer, it must issue the append complete command through STCR. The CD2231, upon
transmitting the last characters from the buffer, sets EOB, thus allowing the host to allocate a new
transmit buffer.
Bit 14
Bit 14
Bit 6
Bit 6
EOF
Bit 6
Intelligent Two-Channel LAN and WAN Communications Controller — CD2231
Bit 13
Bit 13
EOB
Bit 5
Bit 5
Bit 5
Binary count value, 16-bit count, bits 15:8
Binary count value, 16-bit count, bits 15:8
Binary count value, 16-bit count, bits 7:0
Binary count value, 16-bit count bits 7:0
Bit 12
Bit 12
Bit 4
Bit 4
Bit 4
0
Bit 11
Bit 11
Bit 3
Bit 3
Bit 3
0
map32
Bit 10
Bit 10
Bit 2
Bit 2
Bit 2
Motorola Hex Address: x’5F
Motorola Hex Address: x’5A
Motorola Hex Address: x’58
INTR
Bit 1
Bit 9
Bit 1
Bit 9
Bit 1
Intel Hex Address: x’5C
Intel Hex Address: x’5A
Intel Hex Address: x’58
2231own
Bit 0
Bit 8
Bit 0
Bit 8
Bit 0
147

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