MPC5200B datasheet(21/72 Pages) FREESCALE

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MPC5200B Data Sheet, Rev. 3

Freescale Semiconductor

1.3.6.4

Memory Interface Timing-DDR SDRAM Write Command

Figure 8. DDR SDRAM Memory Write Timing

1.3.7

PCI

The PCI interface on the MPC5200B is designed to PCI Version 2.2 and supports 33-MHz and 66-MHz PCI operations. See the

PCI Local Bus Specification; the component section specifies the electrical and timing parameters for PCI components with the

intent that components connect directly together whether on the planar or an expansion board, without any external buffers or

other “glue logic.” Parameters apply at the package pins, not at expansion board edge connectors.

The MPC5200B is always the source of the PCI CLK. The clock waveform must be delivered to each 33-MHz or 66-MHz PCI

component in the system. Figure 9 shows the clock waveform and required measurement points for 3.3 V signaling

environments. Table 22 summarizes the clock specifications.

Table 21. DDR SDRAM Memory Write Timing

Sym

Description

Min

Max

Units

SpecID

tmem_clk

MEM_CLK period

7.5

—

A5.20

tDQSS

Delay from write command to first

rising edge of MDQS

—tmem_clk+0.4

A5.21

datavalid

MDQ valid before rising edge of

MDQS

1.0

—

A5.22

datahold

MDQ valid after rising edge of

MDQS

1.0

—

A5.23

MEM_CLK

Control Signals

MDQ (Data)

MEM_CLK

MDQS (Data Strobe)

NOTE: Control Signals signals are composed of RAS, CAS, MEM_WE, MEM_CS, MEM_CS1, and CLK_EN

Write

tDQSS

Write

datavalid

datahold

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