32
AT40K Series Configuration
1009B–FPGA–03/02
Figure 17.
Slave Serial End of Configuration Download
Notes:
1. For a configuration bitstream error, INIT is driven Low on the second rising edge after the bitstream error is detected. In the
above example, the “0” in the second to last bit of the postamble is inserted to produce the error shown. The proper value is
“1”. The error is shown for timing purposes only; under normal circumstances the bitstream download would terminate
prematurely.
2. The pins CSOUT and CHECK are claimed by the configuration interface only if enabled by the control register. Both are
enabled by default after power-on-reset or manual reset.
Table 13.
Slave Serial Configuration Timing Parameters @ 5V ± 10% Industrial/Commercial Range
Parameter
Description
Min
Typ
Max
Units
t
PPCCLK
Period of CCLK for configuration downloads
30
ns
Period of CCLK for configuration downloads with the check functions enabled
1000
ns
t
SCC
Setup time for CON with respect to rising edge of CCLK
6
10
16
ns
t
SCD
Setup time for data with respect to rising edge of CCLK
6
10
16
ns
t
HCD
Hold time for data with respect to rising edge of CCLK
0
0
0
ns
t
SCCCLK
Setup time for CHECK with respect to rising edge of CCLK at the start of a
configuration download.
6
10
16
ns
t
DCI
Delay from rising edge of CCLK to activation of configuration interface at the start of
re-configuration
6
10
16
ns
t
DCSOUT
Delay from rising edge of CCLK to falling edge of CSOUT by upstream device during a
cascade configuration
6
10
16
ns
t
CONH
Delay from rising edge of CCLK to rising edge release of CON at the end of
configuration.
Timing is measured with a 50pf load and a 2.7K pull-up resistor on CON. Actual time will
depend on system loading of CON.
130
ns
t
CFG
Delay from rising edge of CCLK to the release of dual-use pins to full user functionality.
6
10
16
ns
t
CONH
D0
LAST BIT OF
POSTAMBLE
USER I/O
USER I/O
USER I/O
t
CFG
USER I/O
20K PULL-UP (INTERNAL)
USER I/O
t
DCSOUT
x
x
1
x
x
0
CCLK
CON
LDC
HDC
CSOUT
(2)
INIT
(1)
10K PULL-UP
(INTERNAL)
NO MORE
CLOCKS NEEDED
