apa075 Actel Corporation, apa075 Datasheet - Page 73

• Manufacturer Part Number: apa075
• Description: Proasicplus Flash Family Fpgas
• Manufacturer: Actel Corporation

Asynchronous FIFO Read
Note: The plot shows the normal operation status.
Figure 1-43 • Asynchronous FIFO Read
Table 1-61 • T
Symbol t
ERDH, FRDH,
THRDH
ERDA
FRDA
ORDA
ORDH
RDCYC
RDWRS
RDH
RDL
RPRDA
RPRDH
THRDA
Notes:
1. At fast cycles, ERDA and FRDA = MAX (7.5 ns – RDL), 3.0 ns.
2. At fast cycles, RDWRS (for enabling read) = MAX (7.5 ns – WRL), 3.0 ns.
3. All –F speed grade devices are 20% slower than the standard numbers.
xxx
T
J
J
= 0°C to 110°C; V
= –55°C to 150°C, V
Old EMPTY, FULL, EQTH, & GETH valid hold
time from RB ↑
New DO access from RB ↓
WB ↑, clearing EMPTY, setup to
RB high phase
Old RPE valid from RB ↓
New EMPTY access from RB ↑
FULL↓ access from RB ↑
Old DO valid from RB ↓
Read cycle time
RB ↓
RB low phase
New RPE access from RB ↓
EQTH or GETH access from RB↑
RB = (RDB+RBLKB)
Description
EQTH, GETH
DD
DD
= 2.3 V to 2.7 V for Commercial/industrial
RDATA
EMPTY
t RDWRS
FULL
= 2.3 V to 2.7 V for Military/MIL-STD-883
RPE
WB
t RPRDH
t ORDH
t ORDA
t RPRDA
t RPRDA
Cycle Start
t RDL
t RDL
Min.
3.0
3.0
3.0
7.5
7.5
3.0
3.0
9.5
4.5
v5.5
1
1
2
t RDCYC
Max.
0.5
3.0
1.0
4.0
t THRDH
t THRDA
t RDH
t RDH
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
(Empty inhibits read)
Empty/full/thresh are invalid from the end of
hold until the new access is complete
Enabling the read operation
Inhibiting the read operation
Inactive
Active
t ERDH , t FRDH
t ERDA , t FRDA
ProASIC
PLUS
Notes
Flash Family FPGAs
1-67