TSB12C01APZ datasheet(19/59 Pages) TI

19 / 59 page

3–3

Table 3–1. Version/Revision Register Field Descriptions

BITS

ACRONYM

FUNCTION NAME

DESCRIPTION

0–15

Version

Version of the TSB12C01A

16 – 31

Revision

Revision of the TSB12C01A

3.2.2

Node-Address/Transmitter Acknowledge Register

The node-address/transmitter acknowledge register controls which packets are accepted/rejected, and it

presents the last acknowledge received for packets sent from the ATF. This register is at offset 04h. The

bus number and node number fields are read/write. The AT acknowledge (ATAck) received is normally read

only. Setting the regRW bit in the diagnostic register makes these fields read/write. The initial value is

FFFF_0000h.

Table 3–2. Node-Address/ Transmitter Acknowledge Register Field Descriptions

BITS

ACRONYM

FUNCTION NAME

DESCRIPTION

0–9

BusNumber

Bus number

BusNumber is the 10-bit IEEE 1212 bus number that the

TSB12C01A uses with the node number in the SOURCE address

for outgoing packets and to accept or reject incoming packets. The

TSB12C01A always accepts packets with a bus number equal to

3FFh.

10 – 15

NodeNumber

Node number

NodeNumber is the 6-bit node number that the TSB12C01A uses

with the bus number in the source address for outgoing packets and

to accept or reject incoming packets. The TSB12C01A always

accepts packets with the node address equal to 3Fh. See

BlkBusDep bits in Table 3–3 for exceptions.

16 – 23

Reserved

24 – 27

ATAck

Address transmitter

acknowledge

received

ATAck is the last acknowledge received by the transmitting node in

response to a packet sent from the asynchronous transmit-FIFO.

When an acknowledge time out occurs, the value written to ATAck

is 0h. See Table 6–13 in IEEE 1394-1995 standard for acknowledge

codes.

28 – 31

Reserved

3.2.3

Control Register

The control register dictates the basic operation of the TSB12C01A. This register is at address 08h and is

read/write. The initial value is 0000_0000h.

Table 3–3. Control-Register Field Descriptions

BITS

ACRONYM

FUNCTION NAME

DESCRIPTION

IdVal

ID Valid

When IdVal is set, the TSB12C01A accepts packets addressed to

the IEEE 1212 address set (Node Number) in the node-address

broadcast packets.

RxSId

Received self-ID

packets

When RxSId is set, the self-identification packets generated by phy

chips during bus initialization are received and placed into the GRF

as a single packet. Each self-identification packet is composed of

two quadlets, where the second quadlet is the logical inverse of the

first. If ACK (4 bits) equals 1h, then the data is good. If ACK equals

Dh, then the data is wrong.

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