Altera POS-PHY Level 2 and 3 Compiler Instrukcja Użytkownika Pobierz pdf (Strona 55)

Chapter 3: Functional Description 3–27

Interface Signals

Preliminary

■ Master sink to slave source

The data flow on the Atlantic interface can be in either direction.

A slave sink responds to write commands from the master source and behaves like a

synchronous FIFO buffer.

A master sink generates read commands to a slave source, when it requires data, and

behaves like a synchronous FIFO buffer controller.

Table 3–13 shows the Atlantic data interface signal definitions.

Figure 3–17. Atlantic Interface Control Options

Note to Figure 3–17:

(1) Buses are unidirectional only.

Atl

nti

Int

ace

ourc

Atl

nti

Int

ace

lave

dat

dav

dat

dav

Atl

nti

Int

ace

Atl

nti

Int

ace

lave

ourc

Table 3–13. Atlantic Interface Data Signals (Part 1 of 2)

Signal Description

dat[63:0]

dat[31:0]

dat[15:0]

dat[7:0]

Data bus. dat carries the packet octets that are transferred across the interface. Data is transmitted in

big-endian order on dat, that is, most significant bit (MSB) first and all valid bits are contiguous with

the MSB.

par Parity signal (optional). par indicates the parity calculated over the dat bus. Odd and even parity are

supported.

sop Start of packet. sop delineates the packet boundaries on the dat bus. When sop is high, the start of

the packet is present on the dat bus. sop is asserted on the first transfer of every packet.

eop End of packet. eop delineates the packet boundaries on the dat bus. When eop is high, the end of the

packet is present on the dat bus. mty indicates the number of invalid bytes the last word is composed

of when eop is asserted. eop is asserted on the last transfer of every packet.

1 2 ... 50 51 52 53 54 55 56 57 58 59 60 61 62

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