CD2481 Datasheet, PDF (195/222 Pages) Intel Corporation – Programmable Four-Channel Communications Controller

Programmable Four-Channel Communications Controller — CD2481
9.6.5.13
0 = Buffer is owned by the host, and not ready for use by the CD2481.
1 = Buffer is owned by the CD2481, and is ready for use by the CD2481.
A Transmit Buffer Status (ATBSTS) –SLIP/MNP4 Mode
Register Name: ATBSTS
Register Description: Transmit Buffer ‘A’ Status Register
Default Value: x’00
Access: Byte Read/Write
Bit 7
Bit 6
Bit 5
Bit 4
Berr
EOF
EOB
0
Bit 3
0
Intel Hex Address: x’5C
Motorola Hex Address: x’5F
Bit 2
0
Bit 1
INTR
Bit 0
2481own
9.6.5.14 B Transmit Buffer Status (BTBSTS) – SLIP/MNP4 Mode
Register Name: BTBSTS
Register Description: Transmit Buffer ‘B’ Status Register
Default Value: x’00
Access: Byte Read/Write
Bit 7
Bit 6
Bit 5
Bit 4
Berr
EOF
EOB
0
Bit 3
0
Intel Hex Address: x’5D
Motorola Hex Address: x’5E
Bit 2
0
Bit 1
INTR
Bit 0
2481own
Bit 7
Bit 6
Bit 5
Bits 4:2
Bit 1
Bit 0
Berr – Bus error (set by the CD2481, 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 CD2481, and cleared by the host)
The end of a host supplied transmit buffer has been reached.
Reserved – must be zero.
INTR – Interrupt
0 = No interrupt required after the buffer is transmitted.
1 = Interrupt required after the buffer is transmitted.
2481own – Ownership of the transmit buffer (set by the host and cleared by the
CD2481)
0 = Buffer is owned by the host, and not ready for use by the CD2481.
1 = Buffer is owned by the CD2481, and is ready for use by the CD2481.
Datasheet
195