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TMS416169P-70 Datasheet(PDF) 3 Page - Texas Instruments

Part # TMS416169P-70
Description  1048576-WORD BY 16-BIT EXTENDED DATA OUT HIGH-SPEED DRAMS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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TMS416169P-70 Datasheet(HTML) 3 Page - Texas Instruments

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TMS55160, TMS55161, TMS55170, TMS55171
262144 BY 16-BIT MULTIPORT VIDEO RAMS
SMVS464 – MARCH1996
3
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
description
The TMS551xx multiport video RAMs (VRAMs) are high-speed dual-ported memory devices. Each consists of
a dynamic random-access memory (DRAM) organized as 262 144 words of 16 bits each interfaced to a
serial-data register [serial-access memory (SAM)] organized as 256 words of 16 bits each. These devices
support three basic types of operation: random access to and from the DRAM, serial access from the serial
register, and transfer of data from the DRAM to the SAM. Except during transfer operations, these devices can
be accessed simultaneously and asynchronously from the DRAM and SAM ports.
The TMS551xx multiport VRAMs provide several functions designed to provide higher system-level bandwidth
and to simplify design integration on both the DRAM and SAM ports (see Table 2). On the DRAM port, greater
pixel draw rates are achieved by the block-write function. The TMS5516x devices’ 4-column block-write function
allows 16 bits of data (present in an on-chip color-data register) to be written to any combination of four adjacent
column-address locations, up to a total of 64 bits of data per CASx cycle time. Similarly, the TMS5517x devices’
8-column block-write function allows 16 bits of data to be written to any combination of eight adjacent
column-address locations, up to a total of 128 bits of data per CASx cycle time. Also on the DRAM port, the
write-per-bit (or write-mask) function allows masking of any combination of the 16 DQs on any write cycle. The
persistent write-per-bit function uses a mask register that, once loaded, can be used on subsequent write cycles
without reloading. All TMS551xx devices offer byte control. Byte control can be applied in write cycles, read
cycles, block-write cycles, load-write-mask-register cycles, and load-color-register cycles. The TMS551xx
devices offer enhanced-page-mode operation that results in faster access time. The TMS551x1 devices also
offer extended-data-output (EDO) mode. The EDO mode is effective in both the page-mode and the standard
DRAM cycles.
The TMS551xx devices offer a split-register-transfer (DRAM to SAM) function. This feature enables real-time
register load implementation for continuous serial-data streams without critical timing requirements. The serial
register is divided into a high half and a low half. While one half is being read out of the SAM port, the other half
can be loaded from the DRAM. For applications not requiring real-time register load (for example, loads done
during CRT-retrace periods), the full-register-transfer operation is retained to simplify system design.
The SAM port is designed for maximum performance. Data can be accessed from the SAM at serial rates up
to 55 MHz. A separate output, QSF, is included to indicate which half of the serial register is active. Refreshing
the SAM is not required because the data register that comprises the SAM is static.
All inputs, outputs, and clock signals on the TMS551xx devices are compatible with Series 74 TTL. All address
lines and data-in lines are latched on-chip to simplify system design. All data-out lines are unlatched to allow
greater system flexibility.
All TMS551xx employ TI’s state-of-the-art EPIC technology combining very high performance with improved
reliability.
All TMS551xx are offered in a 64-pin small-outline gull-wing-leaded package (DGH suffix) for direct surface
mounting.
The TMS551xx VRAMs and other TI multiport VRAMs are supported by a broad line of graphics processors
and control devices from Texas Instruments.


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