Z87L00 Просмотр технического описания (PDF) - Zilog

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Z87L00

SPREAD SPECTRUM CONTROLLERS

Zilog 

Z87000/Z87L00

Spread Spectrum Controllers

Zilog

REGISTER DESCRIPTION (Continued)

Table 25. Bank 2 Register Description

MOD_PWR_CTRL

Field

Bank 2

Bit Position

EXT5

R/W Data

Description

RESERVED

f--------------- R

W

Returns 0

No effect

MOD_PWR_ON

-edcba98--------

R

W

Determines modulator turn-on time referenced to the

transmit frame counter

Returns 0

xXh Bits 6-0 of turn-on time (=(x modulo 128) -1)

RESERVED

--------76543210 R

W

Returns 0

No effect

Notes:

1. MOD_PWR_ON. Controls the turn-on time for the internal modulator and NCO. Only the 7 LSBits of the 9-bit value necessary

to encode an event (from frame counter 0 to 371) are programmable. The two MSBits have fixed values which depend on

whether base station or handset is selected: “00” on the base and “01” on the handset. The modulator’s turn-off time occurs

a fixed time (number of bits) after the turn-on time: 144 bits on the base station, 148 bits on the handset.

2. Changes to this value take effect immediately.

3. To disable the modulator continuously, clear TX_ENABLE

Table 26. Bank 2 Register Description

DEMOD_PWR_CTRL Bank 2

Field

Bit Position

EXT6

R/W Data

Description

RFEON_POLARITY f---------------

R

W

Controls the polarity of the RFEON output pin

Returns 0

0 Active high

1 Active Low

DEMOD_PWR_ON

-edcba98--------

Determines internal power up of demodulator and turn

on time of RXON pin, referenced to the receive frame

counter

R

Returns 0

W xXh Bits 6-0 of turn-on time (=(x modulo 128) -1)

RESERVED

--------7------- R

W

Returns 0

No effect

DEMOD_PWR_OFF ---------6543210

Determine internal power down of demodulator and

turn off time of RXON pin, referenced to the receive

frame counter

R

Returns 0

W XXh Bits 6-0 of turn-off time (=(x modulo 128) -1)

Notes:

1. DEMOD_PWR_ON, DEMOD_PWR_OFF. Controls internal receive hardware and the RXON output pin. The turn-on and off times

are given in number of received bit periods and are referenced to the Receive Frame Counter. Only the 7 LSBits of the 9-bit value

are programmable. The two MSBits have fixed values which depend on whether base station or handset is selected. For

DEMOD_PWR_ON, the two bits are “01” on the base and “00” on the handset. For DEMOD_PWR_OFF, the two bits are “10” on

the base and “01” on the handset

2. Changes to these values take effect immediately.

3. To enable receive power continuously, clear TX_ENABLE and set SYNC_SEARCH_MODE to FULL_SEARCH (this is the case

in acquisition mode).

4. The polarity of the RXON output pin is controlled by the RFRX_POLARITY bit in the RFRX_PWR_CTRL register

.

1-42

PRELIMINARY

DS96WRL0501

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