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SM55161A-80HKCM Arkusz danych(PDF) 11 Page - Austin Semiconductor

Numer części SM55161A-80HKCM
Szczegółowy opis  262144 x 16 BIT VRAM MULTIPORT VIDEO RAM
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Producent  AUSTIN [Austin Semiconductor]
Strona internetowa  http://www.austinsemiconductor.com
Logo AUSTIN - Austin Semiconductor

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VRAM
SM55161A
Production
Austin Semiconductor, Inc.
AustinSemiconductor,Inc.reservestherighttochangeproductsorspecificationswithoutnotice.
11
SMJ55161A
Rev. 1.6
03/05
FIGURE 4: Example of a Byte-Read Cycle
byte operation
Byte operation can be applied in DRAM-read cycles, write
cycles, block-write cycles, load-write-mask-register cycles, and
load-color-register cycles. In byte operation, the column
address (A0–A8) is latched at the first falling edge of CASx\. In
read cycles, CASL\ enables the lower byte (DQ0–DQ7) and
CASU\ enables the upper byte (DQ8–DQ15) (see Figure 4).
In byte-write operation, CASL enables data to be written
to the lower byte (DQ0–DQ7), and CASU\ enables data to be
written to the upper byte (DQ8–DQ15). In an early write cycle,
WE is brought low prior to both CASx\ signals, and data setup
and hold times for DQ0 –DQ15 are referenced to the first falling
edge of CASx\ (see Figure 5).
For late-write or read-modify-write cycles, WE\ is brought
low after either or both CASL\ and CASU\ fall. The data is
strobed in with data setup and hold times for DQ0 –DQ15
referenced to WE\ (see Figure 6).


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