PM25LV020-33SC Просмотр технического описания (PDF) - PMC-Sierra, Inc

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производитель

PM25LV020-33SC

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

SPI MODES DESCRIPTION

Multiple Pm25LV010/020/040 devices can be serially

connected onto the SPI serial bus controlled by a SPI

Master i.e. microcontroller as shown in Figure 1. The

devices support either of the two SPI modes:

Mode 0 (0, 0)

Mode 3 (1, 1)

The difference between these two modes is the clock

polarity when the SPI master is in Stand-by mode: the

serial clock remains at “0” (SCK = 0) for Mode 0 and the

clock remains at “1” (SCK = 1) for Mode 1. Please refer

to Figure 2. For both modes, the input data is latched on

the rising edge of Serial Clock (SCK), and the output

data is available from the falling edge of SCK.

Figure 1. Connection Diagram among SPI Master and SPI Slaves (Memory Devices)

SPI Interface with

(0, 0) or (1, 1)

SDO

SDI

SCK

SCK SO SI

SCK SO SI

SCK SO SI

SPI Master

(i.e. Microcontroller)

CS3 CS2 CS1

SPI Memory

Device

SPI Memory

Device

SPI Memory

Device

CE#

WP# HOLD# CE# WP# HOLD# CE#

WP# HOLD#

Note: 1. The Write Protect (WP#) and Hold (HOLD#) signals should be driven, High or Low as appropriate.

Figure 2. SPI Modes Supported

Mode 0 (0, 0) SCK

Mode 3 (1, 1) SCK

SI

MSB

SO

MSB

Programmable Microelectronics Corp.

5

Issue Date: July, 2005, Rev: 1.2

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