Programmable Logic Devices
347
Logic
Block
I/O
Block
PIA
Figure 9.38 MAX-7000 series CPLD architecture.
FLASH-370 from Cypress is yet another popular class of CPLDs. FLASH-370 CPLDs use FLASH
E
2 PROM technology. Devices are not in-system programmable. One of the salient features of these
devices is that they provide more inputs/outputs than the competing products featuring a linear
relationship between the number of macrocells and the number of bidirectional I/O pins. FLASH370 has a typical CPLD architecture as shown in Fig. 9.40, with multiple PAL-like blocks and a
programmable interconnect matrix to connect them.
Xilinx, although mainly known for their range of FPGAs, offer CPLDs too. Major families of
CPLDs from Xilinx include the XC-7000, CoolRunner and XC-9500 in-system programmable family
of devices. The XC-7000 family of CPLDs further comprises two major series, namely XC-7200
and XC-7300. XC-7300 is an enhanced version of XC-7200 in terms of gate capacity and speed
347
Logic
Block
I/O
Block
PIA
Figure 9.38 MAX-7000 series CPLD architecture.
FLASH-370 from Cypress is yet another popular class of CPLDs. FLASH-370 CPLDs use FLASH
E
2 PROM technology. Devices are not in-system programmable. One of the salient features of these
devices is that they provide more inputs/outputs than the competing products featuring a linear
relationship between the number of macrocells and the number of bidirectional I/O pins. FLASH370 has a typical CPLD architecture as shown in Fig. 9.40, with multiple PAL-like blocks and a
programmable interconnect matrix to connect them.
Xilinx, although mainly known for their range of FPGAs, offer CPLDs too. Major families of
CPLDs from Xilinx include the XC-7000, CoolRunner and XC-9500 in-system programmable family
of devices. The XC-7000 family of CPLDs further comprises two major series, namely XC-7200
and XC-7300. XC-7300 is an enhanced version of XC-7200 in terms of gate capacity and speed