OR3C80 datasheet(19/210 Pages) AGERE

19 / 210 page

Lucent Technologies Inc.

Data Sheet

June 1999

ORCA Series 3C and 3T FPGAs

Programmable Logic Cells (continued)

Memory Mode

The Series 3 PFU can be used to implement a 32 x 4 (128-bit) synchronous, dual-port random access memory

(RAM). A block diagram of a PFU in memory mode is shown in Figure 9. This RAM can also be configured to work

as a single-port memory and because initial values can be loaded into the RAM during configuration, it can also be

used as a read-only memory (ROM).

Figure 9. Memory Mode

The PFU memory mode uses all LUTs and latches/FFs including the ninth FF in its implementation as shown in

Figure 9. The read address is input at the KZ[3:0] and F5[A:D] inputs where KZ[0] is the LSB and F5[A:D] is the

MSB, and the write address is input on CIN (MSB) and DIN[7, 5, 3, 1], with DIN[1] being the LSB. Write data is

input on DIN[6, 4, 2, 0], where DIN[6] is the MSB, and read data is available combinatorially on F[6, 4, 2, 0] and

registered on Q[6, 4, 2, 0] with F[6] and Q[6] being the MSB. The write enable signal is input at ASWE, and two

write port enables are input on CE and LSR. The PFU CLK signal is used to synchronously write the data. The

polarities of the clock, write enable, and port enables are all programmable. Write-port enables may be disabled if

they are not to be used.

5-5969(F)

CIN(WA4)

KZ[3:0]

F5[A:D]

D Q

DIN7(WA3)

D Q

DIN5(WA2)

D Q

DIN3(WA1)

D Q

DIN1(WA0)

D Q

DIN6(WD3)

D Q

DIN4(WD2)

D Q

DIN2(WD1)

D Q

DIN0(WD0)

D Q

ASWE(WREN)

S/R

CE(WPE1)

LSR(WPE2)

CLK

WRITE

READ

D Q

WRITE

RAM CLOCK

ADDRESS[4:0]

DATA[3:0]

ENABLE

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