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| 型號(hào)： | IDT88P8342BHI |
| 廠商： | IDT, Integrated Device Technology Inc |
| 文件頁數(shù)： | 54/98頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SPI3-SPI4 EXCHANGE 820-PBGA |
| 標(biāo)準(zhǔn)包裝： | 24 |
| 系列： | * |
| 其它名稱： | 88P8342BHI |
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58
IDT88P8342 SPI EXCHANGE 2 x SPI-3 TO SPI-4
INDUSTRIALTEMPERATURERANGE
APRIL 10, 2006
EVEN_PARITY A SPI-3 interface is provisioned to generate and to check
for odd or even parity. The PARITY_EN bit must be set for this to become
effective. Odd parity is standard for SPI-3 interfaces.
0=Odd parity on this port
1=Even parity on this port
PARITY_EN A SPI-3 interface is provisioned to enable or disable parity
generation and checking, according to the state of the EVEN_PARITY bit.
0=Disable parity on this SPI-3 port
1=Enable parity on this SPI-3 port
WATERMARK
A SPI-3 interface can be set to a SPI-3 ingress port
watermark value. 0x10 is the highest watermark that can be set, meaning all
ingressbufferswillbefullbeforebackpressurewillbeinitiatedonaSPI-3ingress
interface. The WATERMARK field value of 0x08 is used to set the watermark
forahalf-fullingressbufferbeforetrippingbackpressure.TheunitsofWATER-
MARK are one-sixteenth of the available ingress buffering per unit. Each unit
isequalto128bytes. BACKPRESSURE_ENmustbeset [Register_offset0x01]
forthewatermarktobecomeeffective.Thewatermarkfieldisusuallysetto0x10,
andtheFREE_SEGMENTfieldofTable75,SPI-3ingressportdescriptortables
(Block_base 0x1200) is used for per LID backpressure.
SPI-3 ingress configuration register (Block_base
0x0200 + Register_offset 0x01)
There is one register for SPI-3 ingress configuration per SPI-3 interface.
Each register has read and write access.
The bit fields for a SPI-3 ingress configuration register are described in the
following paragraphs.
BACKPRESSURE_EN
A SPI-3 interface can have backpressure
enabled or disabled. Disabling backpressure means that data coming into the
ingress may be lost if the SPI-3 interface ingress buffers overflow. The SPI-3
interface can run at full-rate, however, since there will be no backpressure.
Attached devices that do not respond properly to backpressure should be
interfaced by disabling backpressure.
Enabling backpressure will cause the I_ENB signal to be asserted when the
ingressbufferfilllevelisequaltotheWATERMARKvalue[Register_offset0x00],
orthefreesegmentbufferthresholdTable75,SPI-3ingressportdescriptortable
(Block_base 0x1200) has been reached for any active LID.
0=Disable backpressure on this SPI-3 ingress.
1=Enable backpressure on this SPI-3 ingress interface.
FIX_LP
A SPI-3 interface can fix the logical port address to 0x00. This
is useful when there is only one LP on an interface, such as with some single-
PHY devices.
0=Donotfixlogicalportaddressto0x00,butusetheactual
LP found in the packet fragments.
1= Fix logical port address to 0x00
SPI-3 ingress fill level register (Block_base 0x0200
+ Register_offset 0x02)
TABLE 51 - SPI-3 INGRESS CONFIGURATION
REGISTER(REGISTER_OFFSET=0x01)
Field
Bits
Length
Initial Value
BACKPRESSURE_EN
0
1
0b1
FIX_LP
1
0b0
Reserved
31:2
30
0x0000
There is one register for SPI-3 ingress fill level register per SPI-3 interface.
Each register has read-only access. The bit fields of a SPI-3 ingress fill level
register are described.
FILL_CUR
CurrentSPI-3ingressbufferfilllevel.Sincethisisareal-time
register, the value read from it will change rapidly and is used for internal
diagnosticsonly.
I_FCLK_AV Current SPI-3 ingress clock availability is checked here.
0=SPI-3 ingress clock not detected on a SPI-3 port
1=SPI-3ingressclocktransitionsdetectedonaSPI-3port
SPI-3 ingress max fill register (Block_base 0x0200
+ Register_offset 0x03)
TABLE 52 - SPI-3 INGRESS FILL LEVEL REGISTER
(REGISTER_OFFSET=0x02)
Field
Bits
Length
Initial Value
FILL_CUR
4:0
5
0x00
I_FCLK_AV
5
1
0b1
TABLE 53 - SPI-3 INGRESS MAX FILL LEVEL
REGISTER(REGISTER_OFFSET=0x03)
Field
Bits
Length
Initial Value
FILL_MAX
4:0
5
0x00
There is one register for SPI-3 ingress max fill level register per SPI-3
interface. Each register has read-only access, and is cleared after reading.
0x10isthehighestfillinglevel,meaningallingressbuffershadbeenfullatsome
time since the last read of the FILL_MAX field. The units of FILL_MAX are one-
sixteenthoftheavailableingressbuffering.Eachunitisequalto128bytes.The
bitfieldofaSPI-3ingressmaxfilllevelregisterisdescribed.TheTable53-SPI-
3 ingress max fill level register (Register_offset=0x03) is for diagnostics only.
FILL_MAX
Maximum SPI-3 ingress buffer fill level since the last read of
the SPI-3 ingress max fill level register.
9.3.3 Block base 0x0500 registers
SPI-3 egress LID to LP map (Block_base 0x0500 +
Register_offset 0x00-0x3F)
TABLE 54 - SPI-3 EGRESS LID TO LP MAP
Field
Bits
Length
Initial Value
LP
7:0
8
0x00
ENABLE
8
1
0b0
BIT_REVERSAL
9
1
0b0
There are 64 SPI-3 egress LID to LP maps per SPI-3 interface, one per
potential SPI-3 LID.
The SPI-3 egress LID to LP maps have read and write access. The SPI-
3egressLIDtoLPmapsareusedtomapSPI-3egresslogicalidentifierstoSPI-
3logicalportaddressesthatarein-bandwiththeSPI-3egresspacketfragments.
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