VP306 datasheet(43/85 Pages) MITEL

43 / 85 page

DRAFT - PRELIMINARY DATA

VP305/6

The duplication or disclosure of data contained on this sheet is subject to the restrictions

on the title page of this document.

The sweep rate varies as a function of the value of CR_SWR register and the delta frequency,

effectively selected by the CR_USWL and CR_LSWL registers. If the delta frequency is halved,

the sweep rate doubles. If the receiver fails to lock, a higher value of CR_SWR should be tried. If

the value of CR_SWR is too low, the frequency sweep may be stopped. The rise and fall times of

the sweep can be adjusted to be equal by setting the value of CR_OFFSET, see page 37. This

becomes more critical at very low values of CR_SWR where the sweep will stop unless the rise

and fall times are equal.

CR _ S W R

100

120

140

160

180

200

220

240

260

VP 305/6 carrier s weep function.

Fig. 16. Carrier sweep rate for a delta frequency of ±10MHz.

2.8.2. CR_USWL U & L: Carrier Upper sweep limit registers.

Parallel mode -

Bank 3. Addresses 2, 3.

Type Read / Write.

Serial mode - Addresses 26, 27.

76543210

Reserved

CR_USWL[13:8] Carrier Upper sweep limit (upper nibble)

CR_USWL[7:0] Carrier Upper sweep limit (lower byte)

These two bytes together form the 14 bit number: CR_USWL[13:0] Carrier Upper sweep limit. This

is the division ratio (upper) for the prescaler input (PSCAL) from the SL1710. See page 12 for

further discussion.

VP306 Datasheet(PDF) 43 Page - Mitel Networks Corporation