Altera IP Compiler for PCI Express Manual do Utilizador Página 334

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B–16 Chapter :
Descriptor/Data Interface
IP Compiler for PCI Express User Guide August 2014 Altera Corporation
Table B–10 shows the bit information for
tx_cred
<n>
[65:0]
for the ×8 IP cores.
[11]
0: No credits available
1: Sufficient credit available for at
least 1 transaction layer packet
Non-Posted data.
[12]
0: No credits available
1: Sufficient credit available for at
least 1 transaction layer packet
Completion header.
[21:13]
9 bits permit advertisement of 256
credits, which corresponds to 4 KBytes,
the maximum payload size.
Completion data, posted data.
Table B–9. tx_cred0[21:0] Bits for the ×1 and ×4 IP cores (Part 2 of 2)
Bits Value Description
Table B–10. tx_cred[65:0] Bits for ×8 IP core
Bits Value Description
tx_cred[7:0]
0-127: Number of credits available
>127: No credits available
Posted header. Ignore this field if the value of
posted header credits,
tx_cred[60]
, is set to
1.
tx_cred[19:8]
0-2047: Number of credits available
>2047: No credits available
Posted data. Ignore this field if the value of
posted data credits,
tx_cred[61]
, is set to 1.
tx_cred[27:20]
0-127: Number of credits available
>127: No credits available
Non-posted header. Ignore this field if value of
non-posted header credits,
tx_cred[62]
, is
set to 1.
tx_cred[39:28]
0-2047: Number of credits available
>2047: No credits available
Non-posted data. Ignore this field if value of
non-posted data credits,
tx_cred[63]
, is set
to 1.
tx_cred[47:40]
0–127: Number of credits available
>127: No credits available
Completion header. Ignore this field if value of
CPL header credits,
tx_cred[64]
, is set to 1.
tx_cred[59:48]
0-2047: Number of credits available
>2047: No credits available
Completion data. Ignore this field if value of
CPL data credits,
tx_cred[65]
, is set to 1.
tx_cred[60]
0: Posted header credits are not infinite
1: Posted header credits are infinite
Posted header credits are infinite when set to
1.
tx_cred[61]
0: Posted data credits are not infinite
1: Posted data credits are infinite
Posted data credits are infinite.when set to 1.
tx_cred[62]
0: Non-Posted header credits are not infinite
1: Non-Posted header credits are infinite
Non-posted header credits are infinite when set
to 1.
tx_cred[63]
0: Non-posted data credits are not infinite
1: Non-posted data credits are infinite
Non-posted data credits are infinite when set to
1.
tx_cred[64]
0: Completion credits are not infinite
1: Completion credits are infinite
Completion header credits are infinite when set
to 1.
tx_cred[65]
0: Completion data credits are not infinite
1: Completion data credits are infinite
Completion data credits are infinite when set to
1.
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