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SAA4952WP

Memory controller

Philips Electronics 

Philips Semiconductors

Memory controller

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SAA4952WP

Table 13 Horizontal programming range of CLV, HWE1 and HVACQS

Nr (programmed start value of corresponding signal) not equal Nf (programmed stop value of corresponding signal).

ACQUISITION FREQUENCY

(MHz)

12

13.5

16

18

TIMING EQUATIONS

CLVr = (4Nr + 2)LLA

CLVf = (4Nf + 2)LLA

HWE1r = (2Nr + 2)LLA

HWE1f = (2Nf + 2)LLA

HVACQS1 = (4N(1) + 2)LLA

HVACQS2 = (4M(2) + 2)LLA

CLVr = (4Nr + 2)LLA

CLVf = (4Nf + 2)LLA

HWE1r = (2Nr + 2)LLA

HWE1f = (2Nf + 2)LLA

HVACQS1 = (4N(1) + 2)LLA

HVACQS2 = (4M(2) + 2)LLA

CLVr = (4Nr + 2)LLA

CLVf = (4Nf + 2)LLA

HWE1r = (2Nr + 2)LLA

HWE1f = (2Nf + 2)LLA

HVACQS1 = (4N(1) + 2)LLA

HVACQS2 = (4M(2) + 2)LLA

CLVr = (8Nr + 2)LLA

CLVf = (8Nf + 2)LLA

HWE1r = (4Nr + 2)LLA

HWE1f = (4Nf + 2)LLA

HVACQS1 = (8N(1) + 2)LLA

HVACQS2 = (8M(2) + 2)LLA

PROGRAMMING RANGE

0 ≤ Nr < 191

0 ≤ Nf < 191

0 ≤ Nr < 383

0 ≤ Nf < 383

0 ≤ N < 191

0 ≤ M < 191

0 ≤ Nr < 215

0 ≤ Nf < 215

0 ≤ Nr < 431

0 ≤ Nf < 431

0 ≤ N < 215

0 ≤ M < 215

0 ≤ Nr < 255

0 ≤ Nf < 255

0 ≤ Nr < 511

0 ≤ Nf < 511

0 ≤ N < 255

0 ≤ M < 255

0 ≤ Nr < 143

0 ≤ Nf < 143

0 ≤ Nr < 287

0 ≤ Nf < 287

0 ≤ N < 143

0 ≤ M < 143

Notes

1. N: programmed value of HVACQS1 pulse.

2. M: programmed value of HVACQS2 pulse.

The programmed values include the MSB setting contained in HAMSBDEL.

For SDAF = 1 the factors in front of Nr and Nf are doubled.

For EXTLLA = 1 the equations for LLA = 18 MHz are valid.

The programming margins depend on the used external clock frequency.

L----L---A---1-E----X----T-- × N ≤ 64 µs

1997 Jun 10

15

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