參數資料
型號: IDT88K8483BRI
廠商: IDT, Integrated Device Technology Inc
文件頁數: 104/162頁
文件大?。?/td> 0K
描述: IC SPI-4 EXCHANGE 3PORT 672-BGA
標準包裝: 24
系列: *
其它名稱: 88K8483BRI
46 of 162
October 20, 2006
IDT IDT88K8483
Figure 17 SPI-4 Egress State Block Diagram
Tx Machine
Control words are inserted only between the transfers. Once a transfer has begun, the data words are sent uninterrupted until a whole transfer is
complete. The interval between the end of a given transfer and the next payload control word consists of zero or more idle control words and training
patterns. Successive SOP must occur not less than 8 cycles apart. Figure 18 Egress word transition state machine p.46 shows the word
transition on the interface. The adjacent device that generates the transfer have to meet the requirements as described in Figure 18 Egress word
Figure 18 Egress word transition state machine
The SPI-4 interface loads data and overhead from the egress port buffer and generates transfer. The cycle to cycle behavior is described in
The number of idle control words between transfers is less than or equal to 4 if there
is data for transmit. The LID to logical port mapping is configured by SPI-4 Ingress Training to out of sync threshold Register (p. 111). Multiple LID can
not be mapped to the same logical port. LID can not be remapped in the IN_SYNCH status.
Packet mode and cut through mode selection is defined in PFP. The main SPI-4 transmit data from module A/B in round robin. In cut-through
mode, the unit is one transfer, while In packet mode, the unit is one packet.
If only one byte of the SPI-4 16 bit wide data is valid, then 8 LSB (B7 to B0) are fixed to 0.
Status
termination
TX machine
Locker
Skew
control
Bit
aligne
De-skew
data
status
PFP
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