M50LPW116 datasheet(8/36 Pages) STMICROELECTRONICS

Part #	M50LPW116

Description	16 Mbit 2Mb x8, Boot Block 3V Supply Low Pin Count Flash Memory

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Table 6. LPC Bus Read Field Definitions

Clock Cycle

Number

Clock

Cycle

Count

Field

LAD0-

LAD3

Memory

I/O

Description

1

START

0000b

I

On the rising edge of CLK with LFRAME Low, the contents

of LAD0-LAD3 must be 0000b to indicate the start of a

LPC cycle.

21

CYCTYPE

+ DIR

0100b

I

Indicates the type of cycle and selects 1-byte reading. Bits

3:2 must be 01b. Bit 1 indicates the direction of transfer: 0b

for read. Bit 0 is reset to 0.

3-10

8

ADDR

XXXX

I

A 32-bit address phase is transferred starting with the

most significant nibble first. A26-A31 must be set to 1. A22

= 1 for Array, A22 = 0 for registers access. For A21, A23-

A25 values, refers to Table 2.

11

1

TAR

1111b

I

The host drives LAD0-LAD3 to 1111b to indicate a

turnaround cycle.

12

1

TAR

1111b

(float)

O

The LPC Flash Memory takes control of LAD0-LAD3

during this cycle.

13-14

2

WSYNC

0101b

O

The LPC Flash Memory drives LAD0-LAD3 to 0101b

(short wait-sync) for two clock cycles, indicating that the

data is not yet available. Two wait-states are always

included.

15

1

RSYNC

0000b

O

The LPC Flash Memory drives LAD0-LAD3 to 0000b,

indicating that data will be available during the next clock

cycle.

16-17

2

DATA

XXXX

O

Data transfer is two CLK cycles, starting with the least

significant nibble.

18

1

TAR

1111b

O

The LPC Flash Memory drives LAD0-LAD3 to 1111b to

indicate a turnaround cycle.

19

1

TAR

1111b

(float)

N/A

The LPC Flash Memory floats its outputs, the host takes

control of LAD0-LAD3.

Figure 4. LPC Bus Read Waveforms

AI04429

CLK

LFRAME

LAD0-LAD3

Number of

clock cycles

START

CYCTYPE

+ DIR

ADDR

TAR

SYNC

DATA

TAR

1182322

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