RAM 8.0 BUX II Series Guia do Utilizador Página 40

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40 www.xilinx.com 7 Series FPGAs Memory Resources
UG473 (v1.11) November 12, 2014
Chapter 1: Block RAM Resources
Block RAM Timing Characteristics
The timing diagram in Figure 1-15 describes a single-port block RAM in write-first mode
without the optional output register. The timing for read-first and no-change modes are
similar. For timing using the optional output register, an additional clock latency appears
at the DO pin. These waveforms correspond to latch mode when the optional output
pipeline register is not used.
At time 0, the block RAM is disabled; EN (enable) is Low.
T
RCCK_REGCE
Optional Output
Register Enable
REGCE
Time before the CLK that the register enable signal must be stable at
the REGCE input of the block RAM.
T
RCKC_REGCE
Time after the clock that the register enable signal must be stable at
the REGCE input of the block RAM.
Clock to Out Delays
T
RCKO_DO
(latch mode)
Clock to Output
CLK to
DO
Time after the clock that the output data is stable at the DO outputs
of the block RAM (without output register).
T
RCKO_DO_REG
(register mode)
Clock to Output
CLK to
DO
Time after the clock that the output data is stable at the DO outputs
of the block RAM (with output register).
Notes:
1. While EN is active, ADDR inputs must be stable during the entire setup/hold time window, even if WE is inactive. Violating this
requirement can result in block RAM data corruption. If ADDR timing could violate the specified requirements, EN must be
inactive (disabled).
Table 1-18: Block RAM Timing Parameters (Contd)
Parameter Function
Control
Signal
Description
X-Ref Target - Figure 1-15
Figure 1-15: Block RAM Timing Diagram
ADDR
DI
DO
EN
RST
WE
CLK
00
DDDD
T
RCCK_ADDR
T
RDCK_DI
T
RCKO_DO
MEM (00)
T
RCCK_EN
T
RCCK_WE
Disabled DisabledRead Write ReadReset
Note 1: Write Mode = WRITE_FIRST
Note 2: SRVAL = 0101
0F
7E
8F 20
CCCC BBBB AAAA 0000
CCCC
(1)
MEM (7E) 0101
(2)
UG473_c1_15_052610
123 54
T
RCCK_RST
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