MSC8113 Reference Manual, Rev. 0
13-6
Freescale Semiconductor
System Bus
13.1.4 Address Transfer Attribute
The address transfer attribute signals further characterize the transfer, such as the size of the
transfer, whether it is a read or write operation, and whether it is a burst or single-beat transfer.
For details on how these signals interact, see
, Address Transfer Attribute Signals
Table 13-5. Address Transfer Attribute Signals
Name
Type
Description
TT[0–4]
Input/Output
Output:
Input
Transfer Type
Use in external master mode. The TT[0–4] signals have no meaning in internal-only mode. For a
complete description of TT[0–4] signals and transfer type encoding. See Section n, Transfer
type signals (TT[0–4]). The transfer type signals define the nature of the transfer requested
(Read or Write). Table 13-10 describes the MSC8113 action as master, slave, and snooper..
State Meaning
Asserted/Deasserted. Specifies the type of transfer in progress.
Timing Comments
Assertion/Deassertion. Same as A[0–31].
High Impedance. Same as A[0–31].
State Meaning
Asserted/Deasserted. Specifies the type of transfer in progress for snooping
by the MSC8113 device.
Timing Comments
Assertion/Deassertion. Same as A[0–31].
TC[0–2]
Input/Output
Transfer Code
Use in external master mode. The TC[0–2] signals have no meaning in internal-only mode. For a
complete description of TC[0–2] signals and transfer code encoding. See Section n, Transfer
Code signals (TC[0–2]). The transfer code signals give supplemental information about the
corresponding address, mainly the source of the transaction, as listed in Table 13-11..
State Meaning
Asserted/Deasserted. Gives supplemental information about the
corresponding address, mainly the source of the transaction.
Timing Comments
Assertion/Deassertion. Same as A[0–31].
High Impedance. Same as A[0–31].
TBST
Input/Output
Transfer Burst
Use in external master mode. TBST has no meaning in internal-only mode.
State Meaning
Asserted. Indicates that a burst transfer is in progress (see Section n,
Transfer burst and size signals (TBST and TSIZ[0–3]). These signals
together indicate the size of the requested data transfer. The signals can be
used with address bits A[27–31] and the device port size to determine which
portion of the data bus contains valid data for a write transaction or which
portion of the bus should contain valid data for a read transaction. The
MSC8113 uses four 32-bit burst transactions for transferring cache blocks.
For these transactions, TSIZ[0–3] are encoded as 0b0010, TBST is
asserted, and address bits A[27–28] determine which 32 bits are sent first.
The MSC8113 supports critical-first burst transactions (32-bit-aligned) from
the processor. The MSC8113 transfers the critical 32 bits of data first,
followed by 32 bits from increasing addresses, wrapping back to the
beginning of the 8-level block as required.).
Deasserted. Indicates that a burst transfer is not in progress.
Timing Comments
Assertion/Deassertion. Same as A[0–31].
High Impedance. Same as A[0–31].
Содержание MSC8113
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