M50LPW116 datasheet(8/36 Pages) STMICROELECTRONICS

8 / 36 page

M50LPW116

8/36

Table 6. LPC Bus Read Field Definitions

Clock Cycle

Number

Clock

Cycle

Count

Field

LAD0-

LAD3

Memory

I/O

Description

START

0000b

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.

CYCTYPE

+ DIR

0100b

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

ADDR

XXXX

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.

TAR

1111b

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

turnaround cycle.

TAR

1111b

(float)

The LPC Flash Memory takes control of LAD0-LAD3

during this cycle.

13-14

WSYNC

0101b

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.

RSYNC

0000b

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

indicating that data will be available during the next clock

cycle.

16-17

DATA

XXXX

Data transfer is two CLK cycles, starting with the least

significant nibble.

TAR

1111b

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

indicate a turnaround cycle.

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

M50LPW116 数据表(PDF) 8 Page - STMicroelectronics

M50LPW116 数据表(HTML) 8 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36

数据表下载

链接网址

M50LPW116 数据表(PDF) 8 Page - STMicroelectronics

M50LPW116 数据表(HTML) 8 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36

数据表 下载

链接网址

数据表下载