CD2231 Intel Corporation, CD2231 Datasheet - Page 149

• Manufacturer Part Number: CD2231
• Description: CD2231 Intelligent Two-channel Lan And Wan Communications Controller
• Manufacturer: Intel Corporation

8.6.5.9
8.6.5.10
Datasheet
Register Name: BTBSTS
Register Description: Transmit Buffer ‘B’ Status
Default Value: x’00
Access: Byte Read/Write
Register Name: ATBSTS
Register Description: Transmit Buffer ‘A’ Status
Default Value: x’00
Access: Byte Read/Write
Bit 7
Bit 7
Berr
Berr
B Transmit Buffer Status (BTBSTS) — SLIP/MNP 4 Mode
Bit 7
Bit 6
Bit 5
Bits 4:2
Bit 1
Bit 0
A Transmit Buffer Status (ATBSTS) — HDLC Mode
Bit 6
EOF
Bit 6
EOF
Intelligent Two-Channel LAN and WAN Communications Controller — CD2231
Berr – Bus error (set by the CD2231, and cleared by the host)
0 = No bus error.
1 = Bus error was detected on the last transfer.
EOF – End of Frame (set and cleared by the host)
0 = This buffer is not the last in frame/block.
1 = This buffer is the last in frame/block.
EOB – The end of a transmit buffer has been reached
(set by the CD2231, and cleared by the host)
The end of a host supplied transmit buffer has been reached.
Reserved – must be ‘0’.
INTR – Interrupt
0 = No interrupt required after the buffer is transmitted.
1 = Interrupt required after the buffer is transmitted.
2231own – Ownership of the transmit buffer (set by the host and cleared by the
CD2231)
0 = Buffer is owned by the host, and not ready for use by the CD2231.
1 = Buffer is owned by the CD2231, and is ready for use by the CD2231.
EOB
EOB
Bit 5
Bit 5
Bit 4
Bit 4
UE
0
Bit 3
Bit 3
0
0
Bit 2
Bit 2
0
0
Motorola Hex Address: x’5F
Motorola Hex Address: x’5E
INTR
INTR
Bit 1
Bit 1
Intel Hex Address: x’5C
Intel Hex Address: x’5D
2231own
2231own
Bit 0
Bit 0
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