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| 型号： | LC5512MC-75QN208I |
| 厂商： | LATTICE SEMICONDUCTOR CORP |
| 元件分类： | PLD |
| 中文描述： | EE PLD, 9.5 ns, PQFP208 |
| 封装： | LEAD FREE, PLASTIC, QFP-208 |
| 文件页数： | 5/95页 |
| 文件大小： | 923K |
| 代理商： | LC5512MC-75QN208I |
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Lattice Semiconductor
ispXPLD 5000MX Family Data Sheet
13
FIFO Mode
In FIFO Mode the multi-function array is configured as a FIFO (First In First Out) buffer with built in control. The
read and write clocks can be different or the same dependent on the application. Four flags show the status of the
FIFO; Full, Empty, Almost Full, and Almost Empty. The thresholds for Full, Almost full and Almost empty are pro-
grammable by the user. It is possible to reset the read pointer, allowing support of frame retransmit in communica-
tions applications. If desired, the block can be used in show ahead mode allowing the early reading of the next read
address.
In this mode one ports accesses 16,384-bits of memory. Data widths of 1, 2, 4, 8, 16 and 32 are supported by the
MFB. Figure 12 shows the block diagram of the FIFO.
Write data, write enable, flag outputs and read enable are synchronous. The Write Data, Almost Full and Full share
the same clock and clock enables. Read outputs are synchronous although these can be configured in look ahead
mode. The Read Data, Empty and Almost Empty signals share the same clock and clock enables. Reset is shared
by all signals. Table 8 shows the possible sources for the clock, clock enable and reset signals for the various reg-
isters.
Figure 12. FIFO Block Diagram
Table 8. Register Clocks, Clock Enables, and Initialization in FIFO Mode
Register
Input
Source
Write Data,
Write Enable
Clock
WCLK or one of the global clocks (CLK0 - CLK3). Each of these signals can be inverted if required.
Clock
Enable
WE or one of the global clocks (CLK1 - CLK 2). Each of these signals can be inverted if required.
Reset
N/A
Full and
Almost Full
Flags
Clock
WCLK or one of the global clocks (CLK0 - CLK3). Each of these signals can be inverted if required.
Clock
Enable
WE or one of the global clocks (CLK1 - CLK 2). Each of these signals can be inverted if required.
Reset
Created by the logical OR of the global reset signal and RST. RST is routed by the multifunction
array from GRP, with inversion if desired.
Read Data,
Empty and
Almost Empty
Flags
Clock
RCLK or one of the global clocks (CLK0 - CLK3). Each of these signals can be inverted if required.
Clock
Enable
RE or one of the global clocks (CLK1 - CLK 2). Each of these signals can be inverted if required.
Reset
Created by the logical OR of the global reset signal and RST. RST is routed by the multifunction
array from GRP, with inversion if desired.
‘
68 Inputs
From
Routing
Write Clock (WCLK)
Write Enable (WE)
Reset (RST)
Read Enable (RE)
Read Clock (RCLK)
Reset_RP (RSTRP)
Write Data
(DI[0:0-31])
16,384-bit
SRAM
Array
FIFO
Control
Logic
*Control logic can be
duplicated in adjacent MFB
in 32-bit mode
RESET
CLK0
CLK3
CLK1
CLK2
Read Data
(DO[0:0-31])
FIFO
Flags*
Full, Empty,
Almost Full,
AlmostEmpty
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