
Intel IXP2800 and IXP2850 Network Processors
Signal Description
32
Datasheet
SPI4_TCLK_REF_H,
SPI4_TCLK_REF_L
I
LVDS
TCLK_REF
Transmit Clock Reference. Buffered
and used to generate TCLK.
2
SPI4_TCLK_H,
SPI4_TCLK_L
O
LVDS
TDCLK
RxClk
Transmit Clock. Used to register
TDAT, TCTL, TPAR, and TPROT.
2
SPI4_TDAT_H(0)
SPI4_TDAT_H(1)
SPI4_TDAT_H(2)
SPI4_TDAT_H(3)
SPI4_TDAT_H(4)
SPI4_TDAT_H(5)
SPI4_TDAT_H(6)
SPI4_TDAT_H(7)
SPI4_TDAT_H(8)
SPI4_TDAT_H(9)
SPI4_TDAT_H(10)
SPI4_TDAT_H(11)
SPI4_TDAT_H(12)
SPI4_TDAT_H(13)
SPI4_TDAT_H(14)
SPI4_TDAT_H(15)
SPI4_TDAT_L(0)
SPI4_TDAT_L(1)
SPI4_TDAT_L(2)
SPI4_TDAT_L(3)
SPI4_TDAT_L(4)
SPI4_TDAT_L(5)
SPI4_TDAT_L(6)
SPI4_TDAT_L(7)
SPI4_TDAT_L(8)
SPI4_TDAT_L(9)
SPI4_TDAT_L(10)
SPI4_TDAT_L(11)
SPI4_TDAT_L(12)
SPI4_TDAT_L(13)
SPI4_TDAT_L(14)
SPI4_TDAT_L(15)
O
LVDS
TDAT[15:0]
RxData[15:0]
Transmit Data to PHY/Switch Fabric.
32
SPI4_TCTL_H,
SPI4_TCTL_L
O
LVDS
TCTL
RxSOF
Transmit Framing indicator.
2
SPI4_TPAR_H,
SPI4_TPAR_L
O
LVDS
Not Used
RxPar
Transmit Parity.
2
SPI4_TPROT_H,
SPI4_TPROT_L
O
LVDS
TPROT
RPROT
Transmit Protocol Type. It indicates
the protocol type, SPI-4 or CSIX-L1, of
the transmit data, and can be ignored
if not needed: 0 = SPI-4, 1 = CSIX-L1.
TPROT is driven to 1 during the entire
CFRAME or 0 for the entire SPI-4
burst.
2
SPI4_TSCLK
I
LVTTL
TSCLK
--
Transmit Status Clock. Used to
register TSTAT.
1
SPI4_TSTAT(0),
SPI4_TSTAT(1)
I
LVTTL
TSTAT[1:0]
--
Transmit FIFO Status.
2
SPI4_PREEMP
I
LVTTL
Impedance Match. In normal
operation, should be tied to logical 0.
1
Table 7.
MSF Data Signals (Sheet 3 of 4)
Signal Name
I/O
Type
SPI-4 Use
CSIX Use
Description
Number