PM25LV040-33QC データシートの表示（PDF） - PMC-Sierra, Inc

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PM25LV040-33QC

1 Mbit / 2 Mbit / 4 Mbit 3.0 Volt-only, Serial Flash Memory With 33 MHz SPI Bus Interface

PMC-Sierra, Inc 

PMC

Pm25LV010/020/040

DEVICE OPERATION (CONTINUED)

READ DATA OPERATION

The Read Data (READ) instruction is used to read memory

data of Pm25LV010/020/040 under normal mode run-

ning up to 33 MHz.

The READ instruction is activated by pulling the CE#

line of the selected device to low (VIL), and the READ

instruction code is transmitted via the Sl line followed by

three bytes address (A23 - A0) to be read. There are

total 24 address bits will be shifted in, only the AMS (most-

significant address) - A0 will be decoded and the rest of

A23 - AMS can be don’t cared. Refer to Table 10 for the

related Address Key. Upon completion, any data on the

Sl will be ignored.

The first byte data D7 - D0 addressed (can be at any

location) is then shifted out onto the SO line. A single

byte data or up to whole memory array can be read out

in one READ instruction. The address is automatically

increamented to the next higher address after each byte

of data is shifted out. The read operation can be termi-

nated any time by driving the CE# high (VIH) after the

data comes out. When the highest address of the de-

vices is reached, the address counter will roll over to the

000000h address allowing the entire memory to be read

in one continuous READ instruction.

Table 10. Address Key

Address

AN

Don't Care Bits

Pm25LV010

A16 - A0

A23 - A17

Figure 11. Read Data Sequence

CE#

Pm25LV020

A17 - A0

A23 - A18

Pm25LV040

A18 - A0

A23 - A19

SCK

SI

SO

0 1 2 3 4 5 6 7 8 9 10 11 28 29 30 31 32 33 34 35 36 37 38 39

INSTRUCTION = 0000 0011b

3-BYTE ADDRESS

23 22 21 ... 3 2 1 0

HIGH IMPEDANCE

7 6 54 3 21 0

Programmable Microelectronics Corp.

16

Issue Date: July, 2005, Rev: 1.2

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