IEEE Std. 1149.1 (JTAG) Boundary Scan Support
The Cyclone device instruction register length is 10 bits and the
USERCODE register length is 32 bits. Tables 3–2 and 3–3 show the
boundary-scan register length and device IDCODE information for
Cyclone devices.
Table 3–2. Cyclone Boundary-Scan Register Length
Device
Boundary-Scan Register Length
EP1C3
EP1C4
EP1C6
EP1C12
EP1C20
339
930
582
774
930
Table 3–3. 32-Bit Cyclone Device IDCODE
IDCODE (32 bits) (1)
Device
Manufacturer Identity
Version (4 Bits)
Part Number (16 Bits)
LSB (1 Bit) (2)
(11 Bits)
EP1C3
EP1C4
EP1C6
EP1C12
EP1C20
0000
0000
0000
0000
0000
0010 0000 1000 0001
0010 0000 1000 0101
0010 0000 1000 0010
0010 0000 1000 0011
0010 0000 1000 0100
000 0110 1110
000 0110 1110
000 0110 1110
000 0110 1110
000 0110 1110
1
1
1
1
1
Notes to Table 3–3:
(1) The most significant bit (MSB) is on the left.
(2) The IDCODE’s least significant bit (LSB) is always 1.
Altera Corporation
January 2007
3–3
Preliminary
ALTERA [ ALTERA CORPORATION ]
