ADE-203-012C (Z)
HM530281
331,776-Word × 8-Bit Frame Memory
Rev. 3
Feb. 1994
The HM530281 memory products prov i d e
completely asynchronous I/O and operate at the high
speed of 50 MHz. 0.8 µm CMOS process is used in
their fabrication.
The HM530281 memory products provide reset,
jump, and line increment/hold pointer contro l
functions that can be used in synchronization with
i n d ependent cl o cks on each of the I/O port s .
Memory can be accessed immediately without any
waiting period after the execution of these functions.
In addition to the FIFO function, the 281 products
support an address structure that is compatible with
HDTV, NTSC, and PAL standards, and can be used
in a wide ra n ge of ap p l i c ations, such as noise
reducers, TBC (time-based correction), inter-frame
YC separation, and special function modes (e.g.,
multi-freeze, P-in-P) in the digital TV, VCR, and
video camera application.
They are also appropriate for use as inter-system
speed conversion buffer memories in communication systems, as cache memories of HDD and
MOD and as frame buffer of VGA.
Features
(1) HM530281
• Organization: 331,776 words × 8 bits
• Completely asynchronous operation of the
serial read port and write port
— Internal generation of read and write addresses
— Internal memory operation control provided
on-chip
• High speed read/write cycle time: 50 MHz
• Reset functions
— Independent execution for read and write ports
— Can be executed with arbitrary timing
— Allow immediate access after execution
(read/write) (for the jump function, when
the address setup is complete)
— Jump address specifiable in 32-word units
• Built-in self-refresh eliminates the need for
external refresh control.
• Power supply voltage: VCC = 5.0 V ±10%
• 2 dimensial Address
• 32 word unit address jump
• Line increment/hold Address pointer control
function
• Window scan function
• Can handle HDTV, NTSC, and PAL standards
— Line length: Up to 1152 bits (arbitrary line
lengths can also be handled by using the
line reset function.)
— Line count: Up to 324 lines
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