Altera PCI Compiler Manual do Utilizador descarregar pdf (Página 93)

Altera Corporation User Guide Version 11.1 3–19

October 2011

Functional Description

l_cmdo[3..0]

Output –

Local command output. The

l_cmdo[3..0] bus is driven by the PCI

MegaCore functions during target transactions. It has the bus

command and the same timing as the

l_adro[31..0] bus. The

command is encoded as presented on the PCI bus.

l_ldat_ackn

Output Low

Local low data acknowledge. The

l_ldat_ackn output is used

during target write and master read transactions. When asserted,

l_ldat_ackn indicates that the least significant DWORD is being

transferred on the

l_dato[31..0] bus, i.e., when l_ldat_ackn

is asserted, the address of the transaction is on a

QWORD boundary

(

ad[2..0] = B"000"). The signals lm_ackn or lt_ackn must be

used to qualify valid data.

During target read transactions,

l_ldat_ackn is used to indicate

the first

DWORD transferred to the PCI side. If the address of the

transaction is a

QWORD boundary, the l_ldat_ackn signal is

asserted.

This signal is not implemented in the

pci_mt32 and pci_t32

functions.

l_hdat_ackn

Output Low

Local high data acknowledge. The

l_hdat_ackn output is used

during target write and master read transactions. When asserted,

l_hdat_ackn indicates that the most significant DWORD is being

transferred on the

l_dato[31..0] bus. In other words, when

l_hdat_ackn is asserted, the address of the transaction is not a

QWORD boundary (ad[2..0] = B"100"). The signals lm_ackn

lt_ackn must be used to qualify valid data.

During target read transactions,

l_hdat_ackn is used to indicate

the first

DWORD transferred to the PCI side. If the address of the

transaction is not a

QWORD boundary, l_ldat_ackn is deasserted

and

l_hdat_ackn is asserted.

This signal is not implemented in the

pci_mt32 and pci_t32

functions.

Table 3–6. PCI Local Address, Data, Command & Byte Enable Signals (Part 3 of 3)

Name Type Polarity Description

1 2 ... 88 89 90 91 92 93 94 95 96 97 98 ... 359 360

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