DS3134 datasheet(93/203 Pages) DALLAS

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DS3134

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Bits 0 to 9 / Starting Block Pointer (TSBP0 to TSBP9). These 10 bits determine which of the 1024

blocks within the transmit FIFO, the host wants the device to configure as the starting block for a

particular HDLC channel. Any of the blocks within a chain of blocks for a HDLC channel can be

configured as the starting block. When these 10 bits are read, they will report the current Block Pointer

being used to read data from the Transmit FIFO by the HDLC Layer 2 engines.

0000000000 (000h) = Use Block 0 as the Starting Block

0111111111 (1FFh) = Use Block 511 as the Starting Block

1111111111 (3FFh) = Use Block 1023 as the Starting Block

TFBPIS

0990h

5432

BLKID7

BLKID6

BLKID5

BLKID4

BLKID3

BLKID2

BLKID1

BLKID0

IAB

IARW

n/a

BLKID9

BLKID8

Note: Bits that are underlined are read only, all other bits are read-write; default value for all bits is 0.

Bits 0 to 9 / Block ID (BLKID0 to BLKID9).

0000000000 (000h) = Block Number 0

0111111111 (1FFh) = Block Number 511

1111111111 (3FFh) = Block Number 1023

Bit 14 / Indirect Access Read/Write (IARW). When the host wishes to read data from the internal

Transmit Block Pointer RAM, this bit should be written to a one by the host. This causes the device to

begin obtaining the data from the block location indicated by the BLKID bits. During the read access, the

IAB bit will be set to one. Once the data is ready to be read from the TFBP register, the IAB bit will be

set to zero. When the host wishes to write data to the internal Transmit Block Pointer RAM, this bit

should be written to a zero by the host. This causes the device to take the data that is currently present in

the TFBP register and write it to the channel location indicated by the BLKID bits. When the device has

completed the write, the IAB will be set to zero.

Bit 15 / Indirect Access Busy (IAB). When an indirect read or write access is in progress, this read only

bit will be set to a one. During a read operation, this bit will be set to a one until the data is ready to be

read. It will be set to zero when the data is ready to be read. During a write operation, this bit will be set

to a one while the write is taking place. It will be set to zero once the write operation has completed.

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