MPC8378E datasheet(41/126 Pages) FREESCALE

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MPC8378E PowerQUICC™ II Pro Processor Hardware Specifications, Rev. 2

Freescale Semiconductor

Local Bus

10.2

Local Bus AC Electrical Specifications

Table 43 describes the general timing parameters of the local bus interface of the device.

Table 43. Local Bus General Timing Parameters—PLL Enable Mode

Parameter

Symbol1

Min

Max

Unit

Notes

Local bus cycle time

tLBK

7.5

Input setup to local bus clock (except LUPWAIT/LGTA)tLBIVKH

1.5

—

3, 4

Input hold from local bus clock

tLBIXKH

1.0

—

3, 4

LUPWAIT/LGTA input setup to local bus clock

tLBIVKH1

1.5

—

3, 4

LALE output fall to LAD output transition (LATCH hold time)

tLBOTOT1

1.5

—

LALE output fall to LAD output transition (LATCH hold time)

tLBOTOT2

3—

LALE output fall to LAD output transition (LATCH hold time)

tLBOTOT3

2.5

—

Local bus clock to LALE rise

tLBKHLR

—4.5

—

Local bus clock to output valid (except LALE)

tLBKHOV

—4.5

Local bus clock to output high impedance for LAD/LDP

tLBKHOZ

—

3.8

3, 8

Output hold from local bus clock for LAD/LDP

tLBKHOX

1—

Note:

1 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, tLBIXKH1 symbolizes local bus

timing (LB) for the input (I) to go invalid (X) with respect to the time the tLBK clock reference (K) goes high (H), in this case for

clock one(1). Also, tLBKHOX symbolizes local bus timing (LB) for the tLBK clock reference (K) to go high (H), with respect to

the output (O) going invalid (X) or output hold time.

2 All timings are in reference to rising edge of LSYNC_IN at LBV

DD/2 and the 0.4 × LBVDD of the signal in question.

3 All signals are measured from LBV

DD/2 of the rising/falling edge of LSYNC_IN to 0.5 × LBVDD of the signal in question.

4 Input timings are measured at the pin.

5 t

LBOTOT1 should be used when LBCR[AHD] is not set and the load on LALE output pin is at least 10pF less than the load on

LAD output pins.

6 t

LBOTOT2 should be used when LBCR[AHD] is set and the load on LALE output pin is at least 10pF less than the load on LAD

output pins.

7 t

LBOTOT3 should be used when LBCR[AHD] is set and the load on LALE output pin equals to the load on LAD output pins.

8 For purposes of active/float timing measurements, the Hi-Z or off state is defined to be when the total current delivered

through the component pin is less than or equal to the leakage current specification.

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