Microwire* Interface; Board Design Tip; Ssp To Serial Flash Interface Example - Intel EP80579 Manual

Intel
Figure 152. SSP to Serial Flash Interface Example
Note:
SSP Clock can be
selected from an internal
or external source.
24.2.2

Microwire* Interface

Microwire is another common serial interface that is widely used to interconnect with
serial devices. The following table shows how the SSP signals can be mapped when
operating in Microwire mode.
SSP_SCLK
SSP_TXD
SSP_RXD
SSP_SFRN
24.2.3

Board Design Tip

Implement standard board design rules for low speed signals. When designing a board,
specify board impedances to match anywhere between 45 to 65 ohm.
®
Intel EP80579 Integrated Processor Product Line
Platform Design Guide
253
®
EP80579 Integrated Processor Product Line—Synchronous Serial Port (SSP) Interface
EP80579
SSP_SCLK
SSP_SFRM
SSP_TXD
SSP_RXD
SSP_EXTCLK
SSP Interface
EXTERNAL
OSCILLATOR
National Microwire
SK - Serial Shift Clock
SO - Serial Out (Master and Slave)
SI - Serial In (Master and Slave)
CS - Chip Select
Serial Flash
CLK
CS_N
D I
DO
SPI Interface
7.2 - 3.6864 MHz
Order Number: 320068-005US
May 2010