105 Hardware Specifications

9

Preliminary/Subject to Change without Notice

25

SYSCLK to output invalid

(output hold)

0.0

—

ns

26

SYSCLK to output high impedance (all except ARTRY)

—

8.0

ns

27

SYSCLK to ARTRY high impedance before precharge

(output hold)

—

8.0

ns

28

SYSCLK to ARTRY precharge enable (1X, 2X, PLL mode)

0.4 * tSYS

+ 2.0

—

ns

5, 6

29

Precharge width for ARTRY

1.0

t

SYS

5, 6

30

SYSCLK to ARTRY high impedance after precharge (1X,

2X PLL modes)

—

1.5 * tSYS

+ 8.0

ns

5

Notes:

All output specifications are measured from the TTL level (0.8 V or 2.0 V) of the signal in question to the

1.4 V of the rising edge of SYSCLK. Processor and memory interface signals are specified from the rising

edge of the processor and memory bus clock, which is the same as SYSCLK in 1:1 mode, but is twice the

frequency in 2:1 mode (processor/memory bus clock rising edges occur on every rising and falling edge of

SYSCLK). Both input and output timings are measured at the pin.

1. All output specifications are measured from the 1.4 V of the rising edge of SYSCLK to the TTL level

(0.8 V or 2.0 V) of the signal in question. The output timings are measured at the pin.

2. Maximum timing specifications assume CL = 50 pF.

3. PCI bus signals are composed of the following signals—LOCK, MEMACK, ISA_MASTER,

C/BE0–C/BE3, PAR, TRDY, FRAME, STOP, DEVSEL, PERR, SERR, and AD0–AD31.

4. PCI point-to-point signals are composed of the GNT signal.

5. tSYS is the period of the external bus clock (SYSCLK) in nanoseconds. The numbers given in the table

must be multiplied by the period of SYSCLK to compute the actual time duration (in nanoseconds) of the

parameter in question.

6. These specifications are nominal values.

7. Shared outputs, TS and ARTRY, require pull-up resistors to hold them negated when there is no bus

master driving.

Table 7. Output AC Timing Specifications (Continued)

Vdd = 3.3

± 5% Vdc, GND = 0 Vdc

Num

Characteristic

Min

Max

Unit

Notes

Freescale Semiconductor, Inc.

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Go to: www.freescale.com

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