Specifications
ispLSI 5256VE
ispLSI 5000VE Description (Continued)
The 32 registered macrocells in the GLB are driven by the
32 outputs from the PTSA or the PTSA bypass. Each
macrocell contains a programmable XOR gate, a pro-
grammable register/latch and the necessary clocks and
control logic to allow combinatorial or registered opera-
tion. The macrocells each have two outputs, combinatorial
and registered. This dual output capability from the
macrocell allows efficient use of the hardware resources.
One output can be a registered function for example,
while the other output can be an unrelated combinatorial
function. A direct register input from the I/O pad facili-
tates efficient use of this feature to construct high-speed
input registers.
Macrocell registers can be clocked from one of several
global or product term clocks available on the device. A
global and product term clock enable is also available to
each register, eliminating the need to gate the clock to the
macrocell registers. Reset for the macrocell register is
provided from the global signal, its polarity is user-
selectable. The macrocell register can be programmed to
operate as a D-type register or a D-type latch.
The 32 outputs from the GLB can drive both the Global
Routing Pool and the device I/O cells. The Global Routing
Pool contains one input from each macrocell output and
one input from each I/O pin.
The input buffer threshold has programmable TTL/3.3V/
2.5V compatible levels. The output driver can source
4mA and sink 8mA in 3.3V mode. The output drivers have
a separate VCCIO reference input which is independent
of the main VCC supply for the device. This feature allows
individual output drivers to drive either 3.3V (from the
device VCC) or 2.5V (from the VCCIO pin) output levels
while the device logic and the output current drive are
powered from device supply (VCC). The output drivers
also provide individually programmable edge rates and
open drain capability. A programmable pullup resistor is
provided to tie off unused inputs. Additionally, a program-
mable bus-hold latch is available to hold tristate outputs
in their last valid state until the bus is driven again by
some device.
Table 1. ispLSI 5000VE Family
Package Type
Device
ispLSI 5128VE
ispLSI 5256VE
ispLSI 5384VE
ispLSI 5512VE
GLBs
4
8
12
16
Macrocells 100 TQFP
128
256
384
512
—
72 I/O
—
—
128 TQFP
96 I/O
96 I/O
—
—
256 fpBGA
—
144 I/O
192 I/O
192 I/O
272 BGA
—
144 I/O
192 I/O
192 I/O
388 fpBGA
—
—
—
256 I/O
388 BGA
—
—
—
256 I/O
The ispLSI 5000VE Family features 3.3V, non-volatile in-
system programmability for both the logic and the
interconnect structures, providing the means to develop
truly reconfigurable systems. Programming is achieved
through the industry standard IEEE 1149.1-compliant
Boundary Scan interface. Boundary Scan test is also
supported through the same interface.
An enhanced, multiple cell security scheme is provided
that prevents reading of the JEDEC programming file
when secured. After the device has been secured using
this mechanism, the only way to clear the security is to
execute a bulk-erase instruction.
ispLSI 5000VE Family Members
The ispLSI 5000VE Family ranges from 128 macrocells
to 512 macrocells and operates from a 3.3V power
supply. All family members will be available with multiple
package options. The ispLSI 5000VE Family device
matrix showing the various bondout options is shown in
the table below.
The interconnect structure (GRP) is very similar to Lattice's
existing ispLSI 1000, 2000 and 3000 families, but with an
enhanced interconnect structure for optimal pin locking
and logic routing. This eliminates the need for registered
I/O cells or an Output Routing Pool.
The ispLSI 5000VE encompasses the innovative fea-
tures of the ispLSI 5000VA family with several
enhancements. The macrocell is optimized and the T-
type flip flop option is removed. To improve the efficiency
of design fits, the Product Term Reset Logic is simplified
and the polarity option as well as the Global Preset
function are removed. The programmable output-delay
feature (skew option) is also removed. As a result, the
ispLSI 5000VE is not JEDEC compatible with the ispLSI
5000VA. ispLSI 5000VA and 5000VE pinouts may differ
in the same package, however all programming and
power/ground pins are located in the same locations.
3
LATTICE [ LATTICE SEMICONDUCTOR ]
