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Lattice Semiconductor
Detailed Register Descriptions (Continued)
CSIX Level 1 IP Core User’s Guide
Address: 0x805C
Name: Out_Cntrl_Hi_Watermark_0
D7
D6
D5
D4
D3
D2
D1
D0
OBC_HI_WMARK_0
Default value: 0x3f
Description:
OBC_HI_WMARK_0
Mode: Read/Write
Channel 0, high watermark for outbound control FIFO. This value represents the number of
FIFO words (4 bytes) that assert the FIFO high watermark. When the number of words in the
FIFO exceeds this value, the FIFO’s PARTIAL_FULL signal asserts.
Watermark registers for channels 1 through 3 reside at locations 0x8080 - 0x811C as shown in the register map.
The detailed descriptions for these register are the same as shown for channel 0 except that the registers control
their associated channel instantiation. For brevity, these register descriptions are not shown.
Note that when channel aggregation is used, the watermark settings of the channel with highest precedence con-
trol the behavior of all the aggregated FIFOs. The watermark settings of the lower order channels have no affect on
FIFO operation.
Address: 0x8140
Name: FIFO Under?ow Error Register
D7
—
D6
—
D5
—
D4
—
D3
UF_ERR_3
D2
UF_ERR_2
D1
UF_ERR_1
D0
UF_ERR_0
Default value: n/a
Description:
UF_ERR_N
Address: 0x8144
Mode: Clear on Read
When high, indicates that one of the FIFOs for channel N experienced an under?ow error. The
associated channel’s FIFOs should be ?ushed to guarantee proper operation after the under-
?ow. This bit clears upon reading. If the stimulus that caused the error is removed, then the
error bit in this register will clear after reading.
Name: FIFO Over?ow Error Register
D7
—
D6
—
D5
—
D4
—
D3
OF_ERR_3
D2
OF_ERR_2
D1
OOF_ERR_1
D0
OF_ERR_0
Default value: n/a
Description:
OF_ERR_N
Mode: Clear on Read
When high, indicates that one of the FIFOs for channel N experienced an over?ow error. The
associated channel’s FIFOs should be ?ushed to guarantee proper operation after the under-
?ow. This bit clears upon reading. If the stimulus that caused the error is removed, then the
error bit in this register will clear after reading.
12
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