Cirrus-logic EP7311 Manual do Utilizador descarregar pdf (Página 20)

20 Copyright Cirrus Logic, Inc. 2011

EP7311

High-Performance, Low-Power System on Chip

SDRAM Refresh Cycle

Note: 1. Timings are shown with CAS latency = 2

2. The SDCLK signal may be phase shifted relative to the rest of the SDRAM control and data signals due to uneven loading.

Designers should take care to ensure that delays between SDRAM control and data signals are approximately equal

SDCLK

SDCS

SDRAS

SDCAS

SDQM

[3:0]

SDMWE

SDATA

ADDR

CSa

RAa

CSd

RAd

CAa

CAd

Figure 6. SDRAM Refresh Cycle Timing Measurement

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 41 42

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Cirrus-logic EP7311 Manual do Utilizador Página 20