M50FW080 datasheet(21/56 Pages) STMICROELECTRONICS

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M50FW080

Bus operations

21/55

Figure 7.

FWH Bus Write waveforms

Table 5.

FWH Bus Write field definitions

Clock

Cycle

Number

Clock

Cycle

Count

Field

FWH0-

FWH3

Memory

I/O

Description

START

1110b

On the rising edge of CLK with FWH4 Low, the

contents of FWH0-FWH3 indicate the start of a

FWH Write Cycle.

IDSEL

XXXX

Indicates which FWH Flash Memory is selected.

The value on FWH0-FWH3 is compared to the

IDSEL strapping on the FWH Flash Memory pins

to select which FWH Flash Memory is being

addressed.

3-9

ADDR

XXXX

A 28-bit address phase is transferred starting with

the most significant nibble first.

MSIZE

0000b

Always 0000b (single byte transfer).

11-12

DATA

XXXX

Data transfer is two cycles, starting with the least

significant nibble.

TAR

1111b

The host drives FWH0-FWH3 to 1111b to indicate

a turnaround cycle.

TAR

1111b

(float)

The FWH Flash Memory takes control of FWH0-

FWH3 during this cycle.

SYNC

0000b

The FWH Flash Memory drives FWH0-FWH3 to

0000b, indicating it has received data or a

command.

TAR

1111b

The FWH Flash Memory drives FWH0-FWH3 to

1111b, indicating a turnaround cycle.

TAR

1111b

(float)

N/A

The FWH Flash Memory floats its outputs and the

host takes control of FWH0-FWH3.

AI03441

CLK

FWH4

FWH0-FWH3

Number of

clock cycles

START

IDSEL

ADDR

MSIZE

DATA

TAR

SYNC

TAR

11712212

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