Rainbow-electronics W90P710CDG Manual do Utilizador descarregar pdf (Página 73)

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W90P710CD/W90P710CDG

Publication Release Date: September 19, 2006

- 73 - Revision B2

Continued.

BITS DESCRIPTION

[3:2] BTSIZE

Boot ROM/FLASH data bus width

This ROM/Flash bank is designed for a boot ROM. BASADDR bits

determine its start address. The external data bus width is determined by

the data bus signals D [13:12] power-on setting.

BTSIZE [3:2] Bus Width D [13:12] Bus Width

0 0 8-bit Pull-down Pull-down 8-bit

0 1 16-bit Pull-down Pull-up 16-bit

1 0 32-bit Pull-up Pull-down 32-bit

1 1 RESERVED Pull-up Pull-up RESERVED

[1:0] PGMODE

Page mode configuration

PGMODE [1:0] Mode

0 0 Normal ROM

0 1 4 word page

1 0 8 word page

1 1 16 word page

Fig6.3.2 ROM/FLASH Read Operation Timing

1 2 ... 68 69 70 71 72 73 74 75 76 77 78 ... 551 552

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