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62 www.xilinx.com SPI-4.2 Lite v4.3 User Guide
UG181 June 27, 2008
Chapter 4: Designing with the Core
R
Sink Calendar Initialization
There are two ways to initialize the Sink Calendar: by loading a COE file in the CORE
Generator GUI or initializing in-circuit at startup. Using the Generator GUI loads the
Calendar contents into the UCF file. For more information, see Chapter 3, “Generating the
Core.”
Initializing the Calendar In-Circuit
At startup, the Sink Calendar buffer can be programmed by first deasserting Sink Enable
(SnkEn), then using the calendar write enable, address bus, and data bus. SnkCalAddr is
used to indicate the location in the calendar buffer, and SnkCalData is used to indicate
the channel number that should be written into that location. When outputting RStat, the
status for the channel written to SnkCalAddr=0 is output first, followed by
Figure 4-6: Status FIFO Calendar and Status Memory Block Diagram
Status Memory
0 1 2 3 4 5 6 7
8 9 10 11 12 13 14 15
248 249 250 251 252 253 254 255
15
247
. . .
. . .
Sink FIFO
Status Interface
Sink
Calendar
Control
SnkCalClk
SnkCalWrEn_n
SnkCalAddr[8:0]
SnkCalData[7:0]
SnkCalDataOut[7:0]
Calendar RAM
.
.
.
0
1
2
3
4
5
509
510
511
SnkCalendar_M
SnkCalendar_Len
RSTAT[1:0]
SnkStatAddr = 0
Bank 0: Ch 0-15
SnkStatClk
SnkStatAddr[3:0]
SnkStat[31:0]
SnkStatWrEn_n
SnkStatMask[15:0]