MPC8280 datasheet(266/1386 Pages) FREESCALE

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60x Signals

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

7-8

Freescale Semiconductor

Timing Comments

Assertion/Negation—Same as A[0–31].

High Impedance—Same as A[0–31].

7.2.4.3

Transfer Burst (TBST)

The transfer burst (TBST) signal is an input/output signal on the MPC8280. Following are the state

meaning and timing comments for the TBST output/input signal.

State Meaning

Asserted—Indicates that a burst transfer is in progress (see Section 8.4.3.3,

“TBST and TSIZ[0–3] Signals and Size of Transfer”). During graphics transfer

operations, this signal forms part of the Resource ID field from the EAR as

follows:

TBST || TSIZ[0–3] = EAR[28–31]. (See TBST.)

Negated—Indicates that a burst transfer is not in progress.

Timing Comments

Assertion/Negation—Same as A[0–31].

High Impedance—Same as A[0–31].

7.2.4.4

Global (GBL)

The global (GBL) signal is an input/output signal on the MPC8280.

7.2.4.4.1

Global (GBL)—Output

Following are the state meaning and timing comments for the GBL output signal.

State Meaning

Asserted—Indicates that the transaction is global and should be snooped by other

devices. GBL reflects the M bit (WIM bits) from the MMU except during certain

transactions.

Negated—Indicates that the transaction is not global and should not be snooped

by other devices.

Timing Comments

Assertion/Negation—Same as A[0–31].

High Impedance—Same as A[0–31].

7.2.4.4.2

Global (GBL)—Input

Following are the state meaning and timing comments for the GBL input signal.

State Meaning

Asserted—Indicates that a transaction must be snooped by MPC8280.

Negated—Indicates that a transaction should not be snooped by MPC8280. (In

addition, certain non-global transactions are snooped for reservation coherency.)

Timing Comments

Assertion/Negation—Same as A[0–31].

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