MPC8555CPXAPF datasheet(44/88 Pages) FREESCALE

44 / 88 page

MPC8555E PowerQUICC™ III Integrated Communications Processor Hardware Specifications, Rev. 4

Freescale Semiconductor

CPM

Figure 22 provides the AC test load for the CPM.

Figure 22. CPM AC Test Load

Figure 23 through Figure 29 represent the AC timing from Table 33 and Table 34. Note that although the

specifications generally reference the rising edge of the clock, these AC timing diagrams also apply when

the falling edge is the active edge.

PIO inputs—input hold time

tPIIXKH

1ns

COL width high (FCC)

tFCCH

1.5

CLK

Notes:

1. Input specifications are measured from the 50% level of the signal to the 50% level of the rising edge of CLKIN. Timings are

measured at the pin.

2. The symbols used for timing specifications herein follow the pattern of t(first two letters of functional block)(signal)(state)

(reference)(state) for inputs and t(first two letters of functional block)(reference)(state)(signal)(state) for outputs. For example, tFIIVKH

symbolizes the FCC inputs internal timing (FI) with respect to the time the input signals (I) reaching the valid state (V)

relative to the reference clock tFCC (K) going to the high (H) state or setup time. And tTDIXKH symbolizes the TDM timing

(TD) with respect to the time the input signals (I) reach the invalid state (X) relative to the reference clock tFCC (K) going to

the high (H) state or hold time.

3. PIO and TIMER inputs and outputs are asynchronous to SYSCLK or any other externally visible clock. PIO/TIMER inputs

are internally synchronized to the CPM internal clock. PIO/TIMER outputs should be treated as asynchronous.

Table 34. CPM Output AC Timing Specifications 1

Characteristic

Symbol 2

Min

Max

Unit

FCC outputs—internal clock (NMSI) delay

tFIKHOX

15.5

FCC outputs—external clock (NMSI) delay

tFEKHOX

SCC/SMC/SPI outputs—internal clock (NMSI) delay

tNIKHOX

0.5

SCC/SMC/SPI outputs—external clock (NMSI) delay

tNEKHOX

TDM outputs/SI delay

tTDKHOX

2.5

PIO outputs delay

tPIKHOX

111

Notes:

1. Output specifications are measured from the 50% level of the rising edge of CLKIN to the 50% level of the signal. Timings

are measured at the pin.

2. The symbols used for timing specifications follow the pattern of t(first two letters of functional block)(signal)(state) (reference)(state) for

inputs and t(first two letters of functional block)(reference)(state)(signal)(state) for outputs. For example, tFIKHOX symbolizes the FCC

inputs internal timing (FI) for the time tFCC memory clock reference (K) goes from the high state (H) until outputs (O) are

invalid (X).

Table 33. CPM Input AC Timing Specifications 1 (continued)

Characteristic

Symbol 2

Min3

Unit

Output

Z0 = 50 Ω

OVDD/2

RL = 50 Ω

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