TSB14C01A, TSB14C01AI, TSB14C01AM

5-V IEEE 1394-1995 BACKPLANE TRANSCEIVER/ARBITER

SGLS107A – FEBRUARY 1999 – REVISED NOVEMBER 1999

6

POST OFFICE BOX 655303

Terminal Functions (continued)

TERMINAL

NAME

PM

NO.

HV

NO.

TYPE

I/O

DESCRIPTION

RPREFIX

63

7

TTL

O

Receiver prefix. When asserted high (enabled), RPREFIX alerts the

receiver of an incoming packet. RPREFIX is for test and debug and is not

used in normal operation.

RSTRB

42

54

TTL

I

Receive strobe. RSTRB decodes the received data.

SCLK

10

20

TTL

O

System clock output. A 49.152-MHz or 24.576-MHz clock signal

synchronized with the data transfers, and provided to the link.

TDATA

40

52

CMOS

O

Transmit data. Data to be transmitted is serialized on TDATA.

TI1

58

2

TTL

I

Test input 1. TI1 is used for test purposes only and should be tied to

ground for normal operation.

TSCLK

11

21

TTL

O

System clock output. A 49.152-MHz or 24.576-MHz clock signal that is 180

degrees out of phase with SCLK; it is available if needed.

TSTRB

39

51

CMOS

O

Transmit strobe. TSTRB encodes transmit data.

XI_50

55

67

CMOS

I

External oscillator input. An external 49.152-MHz oscillator can drive the

TSB14C01A.

XI_100

52

64

CMOS

I

External oscillator input. An external 98.304-MHz oscillator can drive the

TSB14C01A.

Table 1. External Priority Coding

EXTERNAL PRIORITY TERMINALS

DESCRIPTION

ENA_PRI

EN_EXPRI

EX_PRI0 – EX_PRI3

DESCRIPTION

X

H

L L L L

L L L H

.

.

.

H H H H

The priority for this node is determined by the values on EX_PRI0 – EX_PRI3.

The state of ENA_PRI can be either tied to VCC or GND.

L

L

X

This sets a 7-bit bus request and is the cable environment format. Priority must be

set by executing a write request (see Table 10).

H

L

X

This sets an 11-bit bus request and is the backplane environment format. Priority

is dynamically set as part of the bus request (see Table 8)