EP2S180F1020C4 Datasheet, PDF (708/768 Pages) Altera Corporation – Stratix II Device Handbook, Volume 1

IEEE Std. 1149.1 BST Operation Control
Figure 9–12. BYPASS Shift Data Register Waveforms
TCK
TMS
TDI
TDO
Bit 1 Bit 2 Bit 3
Bit 1 Bit 2
Bit 4
SHIFT_IR
SHIFT_DR
TAP_STATE
EXIT1_IR SELECT_DR_SCAN
Data shifted into TDI on
Instruction Code ^UPDATE_IR
CAPTURE_DR the rising edge of TCK is
shifted out of TDO on the
falling edge of the same
TCK pulse.
EXIT1_DR
UPDATE_DR
f
IDCODE Instruction Mode
The IDCODE instruction mode is used to identify the devices in an IEEE
Std. 1149.1 chain. When IDCODE is selected, the device identification
register is loaded with the 32-bit vendor-defined identification code. The
device ID register is connected between the TDI and TDO ports, and the
device IDCODE is shifted out.
For more information on the IDCODE for Stratix II and Stratix II GX
devices refer to the Configuration & Testing chapter in volume 1 of the
Stratix II Device Handbook, or the Configuration & Testing chapter in
volume 1 of the Stratix II GX Device Handbook.
USERCODE Instruction Mode
The USERCODE instruction mode is used to examine the user electronic
signature (UES) within the devices along an IEEE Std. 1149.1 chain. When
this instruction is selected, the device identification register is connected
between the TDI and TDO ports. The user-defined UES is shifted into the
device ID register in parallel from the 32-bit USERCODE register. The UES
is then shifted out through the device ID register.
1
The UES value is not user defined until after the device is
configured. Before configuration, the UES value is set to the
default value.
9–16
Stratix II Device Handbook, Volume 2
Altera Corporation
January 2008