isppac-powr1220at8 Lattice Semiconductor Corp., isppac-powr1220at8 Datasheet - Page 48

• Manufacturer Part Number: isppac-powr1220at8
• Description: In-system Programmable Power Supply Monitoring, Sequencing And Margining Controller
• Manufacturer: Lattice Semiconductor Corp.

Lattice Semiconductor
ispPAC-POWR1220AT8 Data Sheet
ispPAC-POWR1220AT8 has no boundary scan logic, the device is put in the BYPASS mode to ensure specification
compatibility. The bit code of this instruction is defined by the 1149.1 standard to be all zeros (00000000).
The optional IDCODE (identification code) instruction is incorporated in the ispPAC-POWR1220AT8 and leaves it in
its functional mode when executed. It selects the Device Identification Register to be connected between TDI and
TDO. The Identification Register is a 32-bit shift register containing information regarding the IC manufacturer,
device type and version code (Figure 1-39). Access to the Identification Register is immediately available, via a
TAP data scan operation, after power-up of the device, or by issuing a Test-Logic-Reset instruction. The bit code for
this instruction is defined by Lattice as shown in Table 1-13.
Figure 1-39. ispPAC-POWR1220AT8 ID Code
MSB
LSB
XXXX / 0000 0001 0100 0100 / 0000 0100 001 / 1
Part Number
(16 bits)
JEDEC Manufacturer
0144h = ispPAC-POWR1220AT8
Identity Code for
Lattice Semiconductor
(11 bits)
Version
Constant 1
(4 bits)
(1 bit)
2
E
Configured
per 1149.1-1990
ispPAC-POWR1220AT8 Specific Instructions
There are 25 unique instructions specified by Lattice for the ispPAC-POWR1220AT8. These instructions are prima-
2
rily used to interface to the various user registers and the E
CMOS non-volatile memory. Additional instructions are
used to control or monitor other features of the device. A brief description of each unique instruction is provided in
detail below, and the bit codes are found in Table 1-13.
PLD_ADDRESS_SHIFT – This instruction is used to set the address of the PLD AND/ARCH arrays for subsequent
program or read operations. This instruction also forces the outputs into the OUTPUTS_HIGHZ.
PLD_DATA_SHIFT – This instruction is used to shift PLD data into the register prior to programming or reading.
This instruction also forces the outputs into the OUTPUTS_HIGHZ.
PLD_INIT_ADDR_FOR_PROG_INCR – This instruction prepares the PLD address register for subsequent
PLD_PROG_INCR or PLD_VERIFY_INCR instructions.
PLD_PROG_INCR – This instruction programs the PLD data register for the current address and increments the
address register for the next set of data.
PLD_PROGRAM – This instruction programs the selected PLD AND/ARCH array column. The specific column is
preselected by using PLD_ADDRESS_SHIFT instruction. The programming occurs at the second rising edge of
the TCK in Run-Test-Idle JTAG state. The device must already be in programming mode (PROGRAM_ENABLE
instruction). This instruction also forces the outputs into the OUTPUTS_HIGHZ.
PROGRAM_SECURITY – This instruction is used to program the electronic security fuse (ESF) bit. Programming
the ESF bit protects proprietary designs from being read out. The programming occurs at the second rising edge of
the TCK in Run-Test-Idle JTAG state. The device must already be in programming mode (PROGRAM_ENABLE
instruction). This instruction also forces the outputs into the OUTPUTS_HIGHZ.
PLD_VERIFY – This instruction is used to read the content of the selected PLD AND/ARCH array column. This
specific column is preselected by using PLD_ADDRESS_SHIFT instruction. This instruction also forces the outputs
into the OUTPUTS_HIGHZ.
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