MPC8378ECVRALGA 参数 Datasheet PDF下载

SPI

Table 65. SPI AC Timing Specifications (continued)

Parameter

SPI inputs—Slave mode (external clock) input hold time

Symbol

1

t

NEIXKH

Min

2

Max

—

Unit

ns

Note:

1

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, t

NIKHOV

symbolizes the internal

timing (NI) for the time SPICLK clock reference (K) goes to the high state (H) until outputs (O) are invalid (X).

2. 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. The maximum SPICLK input frequency is 66.666 MHz.

provides the AC test load for the SPI.

Output

Z

0

= 50

Ω

R

L

= 50

Ω

OVDD/2

Figure 51. SPI AC Test Load

through

represent the AC timing from

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.

shows the SPI timing in slave mode (external clock).

SPICLK (input)

t

NEIVKH

tN

EIXKH

Input Signals:

SPIMOSI

(See Note)

Output Signals:

SPIMISO

(See Note)

t

NEKHOV

Note:

The clock edge is selectable on SPI.

Figure 52. SPI AC Timing in Slave Mode (External Clock) Diagram

MPC8378E PowerQUICC

™

II Pro Processor Hardware Specifications, Rev. 2

Freescale Semiconductor

77