CD2481 Datasheet, PDF (186/222 Pages) Intel Corporation – Programmable Four-Channel Communications Controller

CD2481 — Programmable Four-Channel Communications Controller
9.6.4.5
A Buffer Receive Byte Count (ARBCNT)
Register Name: ARBCNT
Register Description: Receive Buffer ‘A’ Byte Count
Default Value: x’0000
Access: Word Read/Write
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Binary Count Value, 16-bit Count bits 15 - 8
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Binary Count Value, 16-bit Count, bits 7 - 0
Intel Hex Address: x’48
Motorola Hex Address: x’4A
Bit 9
Bit 8
Bit 1
Bit 0
9.6.4.6
B Buffer Receive Byte Count (BRBCNT)
Register Name: BRBCNT
Register Description: Receive Buffer ‘B’ Byte Count
Default Value: x’0000
Access: Word Read/Write
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Binary Count Value, 16-bit Count, bits 15 - 8
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Binary Count Value, 16-bit Count bits 7 - 0
Intel Hex Address: x’4A
Motorola Hex Address: x’48
Bit 9
Bit 8
Bit 1
Bit 0
9.6.4.7
These registers contain the number of bytes stored in the external data buffers by the CD2481. The
count is updated after a block of data is moved to memory and when the buffer is terminated. As
initially written by the host, the register contains the number of bytes the buffer can hold.
A Receive Buffer Status (ARBSTS)
Register Name: ARBSTS
Register Description: Receive Buffer ‘A’ Status
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’4C
Motorola Hex Address: x’4F
Bit 2
0
Bit 1
0
Bit 0
2481own
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Datasheet