TSB14C01 datasheet(20/31 Pages) TI

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TSB14C01

5-V IEEE 1394-1995 BACKPLANE TRANSCEIVER/ARBITER

SLLS231B – MARCH 1996 – REVISED MAY 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

PRINCIPLES OF OPERATION

backplane receive data timing

The receiver typically uses the transitions on the incoming bus signals RDATA and RSTRB to derive a clock

at the code bit frequency to extract the NRZ signal on RDATA. This clock can be derived by performing an

exclusive-OR (XOR) of RDATA and RSTRB.

The bus signals, as they appear from the backplane transceiver media and into the receivers, should be within

the constraints outlined by Figure 10.

RDATA

RSTRB

Figure 10. Backplane Receive Data Timing

Table 14. TSB14C01 to Backplane Transceiver Timing

PARAMETER

98.304 Mhz

49.152 MHz

Bit cell period

10.1715 ns nominal

20.343 ns nominal

t2, t3†

Receive (Rx) edge separation

7.6715 ns minimum

17.843 ns minimum

† This parameter is based on a maximum total transmit skew of 2 ns and a maximum backplane skew

of 0.5 ns. This assumes total receive skew is less than receive edge separation (i.e., some skew

margin exists).

backplane timing definitions

D Logic Skew — The skew between data and strobe within the physical layer itself due to internal skews

between data and strobe logic.

D Spatial Skew — The skew between data and strobe due to differences in propagation delays along the

transmission line from arbiter to transceiver. This board delay is of concern when the physical layer and

transceivers are packaged separately.

D Package Skew — The propagation delay difference through the transceiver between the data and strobe

channels.

D Backplane Skew — The skew along the backpane itself due to impedance and/or mismatching of lengths

in the data and strobe lines.

D Receive Setup/Hold — The setup and hold time needed to latch in the incoming data within the phy arbiter,

based off of the recovered clock from Data-Rx and Strobe-Rx.

D Total Transmit Skew — The total skew between data and strobe in transmitting data from the phy out to the

bus. This is given by the following equation.

Total Transmit Skew

+ Transmit Package Skew ) Spatial Skew ) Logic Skew

D Total Receive Skew — The total skew between data and strobe in receiving data from the bus into the phy.

This is given by the following equation.

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