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Data Sheet
ORCA Series 2 FPGAs
June 1999
46
Lucent Technologies Inc.
Configuration Data Format (continued)
Table 9. Configuration Frame Format and Contents
Note:
For slave parallel mode, the byte containing the preamble must be 11110010. The number of leading header dummy bits must
be (n * 8) + 4, where n is any nonnegative integer and the number of trailing dummy bits must be (n * 8), where n is any positive
integer. The number of stop bits/frame for slave parallel mode must be (x * 8), where x is a positive integer. Note also that the bit
stream generator tool supplies a bit stream which is compatible with all configuration modes, including slave parallel mode.
Header
11111111
Leading header—4 bits minimum dummy bits
0010
Preamble
24-Bit Length Count
Configuration frame length
1111
Trailing header—4 bits minimum dummy bits
ID Frame
(Optional)
0
Frame start
P—1
Must be set to 1 to indicate data frame
C—0
Must be set to 0 to indicate uncompressed
Opar, Epar
Frame parity bits
Addr[10:0] =
11111111111
ID frame address
Prty_En
Set to 1 to enable parity
Reserved [42:0]
Reserved bits set to 0
ID
20-bit part ID
111
Three or more stop bits (high) to separate frames
Configuration
Data
Frame
(repeated for
each data frame)
0
Frame start
P—1 or 0
1 indicates data frame; 0 indicates all frames are written
C—1 or 0
Uncompressed—0 indicates data and address are supplied;
Compressed—1 indicates only address is supplied
Opar, Epar
Frame parity bits
Addr[10:0]
Column address in FPGA to be written
A
Alignment bit (different number of 0s needed for each part)
1
Write bit—used in uncompressed data frame
Data Bits
Needed only in an uncompressed data frame
..
111
One or more stop bits (high) to separate frames
End of
Configuration
0010011111111111
16 bits—00 indicates all frames are written
Postamble
111111 . . . . .
Additional 1s