DS3134 datasheet(94/203 Pages) DALLAS

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DS3134

94 of 203

TFBP

0994h

5432

TBP7

TBP6

TBP5

TBP4

TBP3

TBP2

TBP1

TBP0

n/a

TBP9

TBP8

Note: Bits that are underlined are read only, all other bits are read-write.

Bits 0 to 9 / Block Pointer (TBP0 to TBP9). These 10 bits indicate which of the 1024 blocks is the next

block in the link list chain. A block is not allowed to point to itself.

0000000000 (000h) = Block 0 is the Next Linked Block

0111111111 (1FFh) = Block 511 is the Next Linked Block

1111111111 (3FFh) = Block 1023 is the Next Linked Block

TFLWMIS

09A0h

5432

HCID7

HCID6

HCID5

HCID4

HCID3

HCID2

HCID1

HCID0

IAB

IARW

n/a

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

Bits 0 to 7 / HDLC Channel ID (HCID0 to HCID7).

00000000 (00h) = HDLC Channel Number 1

11111111 (FFh) = HDLC Channel Number 256

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

Transmit Low Water Mark RAM, this bit should be written to a one by the host. This causes the device

to begin obtaining the data from the channel location indicated by the HCID bits. During the read access,

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

will be set to zero. When the host wishes to write data to the internal Transmit Low Water Mark 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 TFLWM register and write it to the channel location indicated by the HCID 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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