EP3C16F256I7N Altera, EP3C16F256I7N Datasheet - Page 141

• Manufacturer Part Number: EP3C16F256I7N
• Description: Cyclone III
• Manufacturer: Altera

Altera Corporation-Preliminary
March 2007
Scan Chain Description
Cyclone III PLLs have a 144-bit scan chain.
of bits for each component of the PLL.
Notes to
(1)
(2)
(3)
C4
C3
C2
C1
C0
M
N
Charge Pump
Loop Filter
Total number of bits
Table 6–9. Cyclone III PLL Reprogramming Bits
Block Name
(1)
LSB bit for C4 low-count value is the first bit shifted into the scan chain.
These two control bits include rbypass, for bypassing the counter, and rselodd,
to select the output clock duty cycle.
MSB bit for loop filter is the last bit shifted into the scan chain.
Table
(3)
6–9:
Counter
16
16
16
16
16
16
16
9
9
Number of Bits
Cyclone III Device Handbook, Volume 1
Table 6–9
Other
2
2
2
2
2
2
2
0
0
(2)
(2)
(2)
(2)
(2)
(2)
(2)
PLL Reconfiguration
shows the number
Total
144
18
18
18
18
18
18
18
9
9
6–41