- 您现在的位置：买卖IC网 > Sheet目录1236 > PCI-EXP-T42G5-N1 (Lattice Semiconductor Corporation)IP CORE PCI EXPRESS ORCA 4
Lattice Semiconductor
PCI Express User’s Guide
TLPs are framed by placing a STP Symbol at the start of the TLP and an END Symbol or EDB Symbol at the end
of the TLP. DLLPs are framed by placing an SDP Symbol at the start of the DLLP and an END Symbol at the end of
the DLLP.
Link Training and Status State Machine (LTSSM)
The LTSSM is a set of interacting state machines implemented as per PCI Express base speci?cation 1.0a section
4.2.5, which includes the following category of state functions:
Detect: To detect whether the far end receiver is powered on or not.
Polling: Transmission and reception of training ordered-sets to establish bit lock and symbol lock.
Con?guration: Transmission and reception with negotiated data rate with con?gured link width.
Recovery: Transmission and reception of training ordered-sets to re-establish bit lock and symbol lock.
L0: Normal operation where data and control packets are transmitted and received.
L0s: Power saving state.
L1: Additional power saving state.
L2: State to conserve power aggressively.
External Loop Back: Loop back between receiver and transmitter for testing and validation purposes.
Disabled: Link is disabled.
Link Control Reset: Link is reset.
Note: The Lattice PCI Express IP core currently does not support L0s, L1, L2 and External Loopback states.
Link Width and Lane Sequence Negotiation (LWLSN)
The link width and lane sequence negotiation logic helps the LTSSM block to negotiate and ?nalize the link and
lane number of the core as part of the training process. The core follows the steps as speci?ed in the PCI Express
spec 1.0a for an end point device.
Data Link Layer Implementation
The Data Link Layer tracks the state of the link. It communicates link status with the Transaction and Physical Lay-
ers, and performs Link Management through the Physical Layer.
Before starting normal operation following power-up or interconnect reset it is necessary to initialize ?ow control for
the virtual channel. The TLP traf?c starts only after this ?ow control initialization. This ?ow control initialization is
implemented in the Data Link layer according to PCI Express Speci?cation 1.0a .
Transmit Path
Transmit TLP Block
The Transmit TLP processing block implements the Data Link Layer requirements for TLPs; sequence number gen-
eration mechanism and LCRC calculation. It appends the information to the TLP that is getting transmitted. Also it
implements the mechanism to resend the same TLP if a retry is requested from the receiver component. To support
this mechanism it has to store the whole TLP that is being transmitted until this component receives an ACK for that
particular TLP or until time-out indication occurs.
6
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
PCM18XH2
PROCESSOR MODULE MPLAB-ICE 2000
PCM18XN0
PROCESSOR MODULE FOR ICE2000
PDA-B-24-615-E-2B1-1-C
CIRCUIT BREAKER MAG 1P 15A
PFMF.260.2
PFMF PTC FUSE SMT 2.6A 1812
PFNF.200.2
PFNF PTC FUSE SMT 2A 1206
PFRY.375
PTC-FUSE RADIAL 72 VDC
PFSM.150.33.2
FUSE PTC 8A 15V FST-TRIP SMD
PFUF.150.2
FUSE PTC 3A 6V RESET SMD
相关代理商/技术参数
PCI-EXT+64U-
制造商:Twin Industries 功能描述:EXTENDER CARD, ACTIVE, BUS TYPE, 3.3 VOLTS TEST CARD,
PCI-G-EVB
功能描述:BOARD EVAL DISKONCHIP PCI-G RoHS:否 类别:编程器，开发系统 >> 过时/停产零件编号 系列:mDOC/mModule 标准包装:1 系列:- 传感器类型:CMOS 成像，彩色（RGB） 传感范围:WVGA 接口:I²C 灵敏度:60 fps 电源电压:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相关产品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP
PCIH-10-6P
制造商:Amphenol Corporation 功能描述:CONN 26482 CIRC PIN 6 POS SLDR ST PNL MNT 6TERM - Bulk
PCIH-10-98P
制造商:Amphenol Corporation 功能描述:CONN 26482 CIRC PIN 6 POS SLDR ST PNL MNT 6TERM - Bulk
PCIH-12-10P
制造商:Amphenol Corporation 功能描述:CONN 26482 CIRC PIN 10 POS SLDR ST PNL MNT 10TERM - Bulk
PCIH-12-8P
制造商:Amphenol Corporation 功能描述:CONN 26482 CIRC PIN 8 POS SLDR ST PNL MNT 8TERM - Bulk
PCIH-14-12P
制造商:Amphenol Corporation 功能描述:CONN 26482 CIRC PIN 12 POS SLDR ST PNL MNT 12TERM - Bulk
PCIH-14-19P
制造商:Amphenol Corporation 功能描述:CONN 26482 CIRC PIN 19 POS SLDR ST PNL MNT 19TERM - Bulk