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| 型号： | ORT42G5-EV |
| 厂商： | Lattice Semiconductor Corporation |
| 文件页数： | 70/119页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL ORT42G5/CABLE/ADAPTER |
| 标准包装： | 1 |
| 系列： | ORCA® 4 系列 |
| 类型： | FPGA |
| 适用于相关产品： | ORT42G5 |
| 所含物品： | 板，线缆，电源 |
| 其它名称： | ORT42G5EV |
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Lattice Semiconductor
ORCA ORT42G5 and ORT82G5 Data Sheet
54
Parallel Loopback at the SERDES Boundary
In this parallel loopback differential data are received at the HDINP_xx and HDINN_xx pins and are retransmitted
at the HDOUTP_xx and HDOUTN_xx pins. The loopback path is at the interface between the SERDES blocks and
the MUX and DEMUX blocks and uses the parallel 10-bit buses at these interfaces (see Figure 32b). The loopback
connection is made such that the input signals to the TX SERDES block is the same as the output signals from the
RX SERDES block. In this parallel loopback mode, the MRWDxx[39:0] signal lines remain active and the
TWDxx[31:0], TCOMMAxx[3:0] and TBIT9xx[3:0] signal lines are not used. This mode is normally used for tests
where serial test data is received from and transmitted to either test equipment or via a serial backplane to a
remote card and is the basic loopback path shown earlier in Figure 32(b).
The data rate selection bits TXHR and RXHR in the channel conguration registers must be congured to carry the
same value. Also, the 8b/10b encoder and decoder are excluded from the loopback path by setting the 8b10bT and
8b10bR conguration bits to 0. Table 21 and Table 22 illustrate the control interface register conguration for the
parallel loopback.
Table 21. Parallel Loopback at the SERDES Boundary Conguration Bit Denitions
Table 22. Parallel Loopback at the SERDES Boundary Conguration Bit Denitions for the ORT82G5
30801, 30901
Bit 0 =1 (Channel A)
Bit 1 = 1 (Channel B)
Bit 2 = 1 (Channel C)
Bit 3 = 1 (Channel D)
LOOPENB_xx Set any of the bits 0-3 to 1 to do serial loopback on the corre-
sponding channel.* The high speed serial outputs will not be
active.
*This test mode can also be set using TESTEN_xx in place of LOOPENB_xx. In that case, Test Mode must be set to 00000.
Register
Address (Hex)
Bit Value
Bit Name
Comments
30022, 30032,
30122, 30132
Bit 0 = 0 or 1
TXHR
Set to 0 or 1. TXHR and RXHR bits must be set to the same value.
Bit 7 = 0
8b10bT
Set to 0 The 8b/10b encoder is excluded from the loopback path. The
8b/10b encoder and decoder selection control bits must both be set to 0.
30023, 30033,
30123, 30133
Bit 0 = 0 or 1
RXHR
Set to 0 or 1. TXHR and RXHR bits must be set to the same value.
Bit 3 = 0
8b10bR
Set to 0.The 8b/10b decoder is excluded from the loopback path. The
8b/10b encoder and decoder selection control bits must both be set to 0.
30005, 30105
Bit 7 = 1
GTESTEN
SET to 1 if the loopback is done globally on both channels.
30026, 30036,
30126, 30136
Bits[4:0]
Testmode
Set to 00001
Register
Address (Hex)
Bit Value
Bit Name
Comments
30002, 30012,
30022, 30032,
30102, 30112,
30122, 30132
Bit 0 = 0 or 1
TXHR
Set to 0 or 1. TXHR and RXHR bits must be set to the same value.
Bit 7 = 0
8b10bT
Set to 0 The 8b/10b encoder is excluded from the loopback path. The
8b/10b encoder and decoder selection control bits must both be set to 0.
30003, 30013,
30023, 30033,
30103, 30113,
30123, 30133
Bit 0 = 0 or 1
RXHR
Set to 0 or 1. TXHR and RXHR bits must be set to the same value.
Bit 3 = 0
8b10bR
Set to 0.The 8b/10b decoder is excluded from the loopback path. The
8b/10b encoder and decoder selection control bits must both be set to 0.
30005, 30105
Bit 7 = 1
GTESTEN
SET to 1 if the loopback is done globally on all four channels.
30006, 30016,
30026, 30036,
30106, 30116,
30126, 30136
Bits[4:0]
Testmode
Set to 00001
Register
Address
Bit Value
Bit Name
Comments
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