Specifications ispLSI and pLSI 1032
In-System Programmability
The ispLSI devices are the in-system programmable controls the programming. The interface signals are isp
versions of the Lattice Semiconductor High-Density pro- Enable (ispEN), Serial Data In (SDI), Serial Data Out
grammable Large Scale Integration (pLSI) devices. By (SDO), Serial Clock (SCLK) and Mode (MODE) control.
integrating all the high voltage programming circuitry on- Figure 4 illustrates the block diagram of one possible
chip,programmingcanbeaccomplishedbysimplyshifting scheme for programming the ispLSI devices. For details
data into the device. Once the function is programmed, on the operation of the internal state machine and pro-
2
the non-volatile E CMOS cells will not lose the pattern grammingofthedevicepleaserefertotheISPArchitecture
even when the power is turned off.
and Programming section in this Data Book.
All necessary programming is done via five TTL level The device identifier for the ispLSI 1032 is 0000 0011
logic interface signals. These five signals are fed into the (03 hex). This code is the unique device identifier which
on-chip programming circuitry where a state machine is generated when a read ID command is performed.
Figure 4. ISP Programming Interface
SDO
SDI
MODE
SCLK
ispEN
5-wire ISP
Programming
Interface
ispEN
SCLK
MODE
ispEN
SCLK
MODE
SCLK
SCLK
MODE
MODE
ispLSI
ispGAL
ispGDS
ispLSI
SDI
SDO
SDI
SDO
SDI
SDO
SDI
SDO
0294B
10
1996 ISP Encyclopedia
LATTICE [ LATTICE SEMICONDUCTOR ]
