Z87200 Просмотр технического описания (PDF) - Zilog

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Z87200

SPREAD-SPECTRUM TRANSCEIVER

Zilog 

Zilog

Z87200

Spread-Spectrum Transceiver

All signals available at this port, with one exception, are ex- accessing the transmitter test points is completely different

pressed as two’s complement values, ranging from –128 than the method by which the receiver test points are ac-

to +127 (80H to 7FH). The PN Matched Filter power output

values, available when the value in bits 3-0 of address 38H

cessed. The state of the other address lines does not af-

fect this function, and this function is always enabled. The

4

is set to either 1H or 8H, is an unsigned binary number, availability of TXTEST output signals is only supported for

ranging from 0 to 255 (0H to FFH).

TXIFCLK speeds less than 20 MHz; output with clock

speeds greater than 20 MHz will be indeterminate.

The reset sequence that occurs when the receiver is dis-

abled will also reset the contents of address 38H to a value

of 0. If the RXTEST7-0 bus is to be used to observe any

function other than the PN Matched Filter I and Q inputs,

Table 5. Transmitter Test Functions

ADDR1-0

TXTEST

Description

then the appropriate value must be rewritten.

0H

ISM

Unspread I Symbol

TXTEST (Pin 59)

1H

QSYM

Unspread Q Symbol

Transmitter Test Output. TXTEST provides access to 3

2H

test points within the transmitter as shown in The pin out-

SCODE

Spreading Code

put is selected according to the state of the two least sig-

nificant bits of the address line, ADDR1-0 and the assign-

ments shown in Table 5. Note that this method of

Figure 10. Transmitter and Receiver Test Points

DS96WRL0400

4-27

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