AM8530 datasheet(98/194 Pages) AMD

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Support Circuitry Programming

AMD

5–4

TRxC Out = XTAL Output

TRxC Out = Transmit Clock

TRxC Out = BR Generator Output

TRxC Out = DPLL Output

TRxC O/I

Transmit Clock =

RTxC Pin

Transmit Clock =

TRxC Pin

Transmit Clock = BR Generator Output

Transmit Clock = DPLL Output

Receive Clock =

RTxC Pin

Receive Clock =

TRxC Pin

Receive Clock = BR Generator Output

Receive Clock = DPLL Output

RTxC X TAL/NO X TAL

WR11—Clock Mode Control

5.2.2

Receive Clock Source

The source of the receive clock is controlled by bits D6 and D5 of WR11. The receive

clock may be programmed to come from the

RTxC pin, the TRxC pin, the output of the

baud rate generator, or the transmit output of the DPLL.

5.2.3

Transmit Clock Source

The source of the transmit clock is controlled by bits D4 and D3 of WR11. The transmit

clock may be programmed to come from the

RTxC pin, the TRxC pin, the output of the

baud rate generator, or the transmit output of the DPLL.

Ordinarily the

TRxC pin is an input, but it becomes an output if this pin is not selected as

the source for the transmitter or the receiver, and bit D2 of WR11 is set to ‘1’. The selec-

tion of the signal provided on the

TRxC output pin is controlled by bits D1 and D0 of

WR11. The

TRxC pin may be programmed to provide the output of the crystal oscillator,

the output of the BRG, the receive output of the DPLL or the actual transmit clock. If the

output of the crystal oscillator is selected but the crystal oscillator has not been enabled,

the

TRxC pin will be driven High. The option of placing the transmit clock signal on the

TRxC pin, when it is an output, allows access to the transmit output of the DPLL.

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