64Mb: x4, x8, x16 SDRAM
General Description
General Description
The 64Mb SDRAM is a high-speed CMOS, dynamic random-access memory containing
67,108,864 bits. It is internally configured as a quad-bank DRAM with a synchronous in-
terface (all signals are registered on the positive edge of the clock signal, CLK). Each of
the x4’s 16,777,216-bit banks is organized as 4096 rows by 1024 columns by 4 bits. Each
of the x8’s 16,777,216-bit banks is organized as 4096 rows by 512 columns by 8 bits. Each
of the x16’s 16,777,216-bit banks is organized as 4096 rows by 256 columns by 16 bits.
Read and write accesses to the SDRAM are burst-oriented; accesses start at a selected
location and continue for a programmed number of locations in a programmed se-
quence. Accesses begin with the registration of an ACTIVE command, which is then fol-
lowed by a READ or WRITE command. The address bits registered coincident with the
ACTIVE command are used to select the bank and row to be accessed (BA[1:0] select the
bank; A[11:0] select the row). The address bits registered coincident with the READ or
WRITE command are used to select the starting column location for the burst access.
The SDRAM provides for programmable read or write burst lengths (BL) of 1, 2, 4, or 8
locations, or the full page, with a burst terminate option. An auto precharge function
may be enabled to provide a self-timed row precharge that is initiated at the end of the
burst sequence.
The 64Mb SDRAM uses an internal pipelined architecture to achieve high-speed opera-
tion. This architecture is compatible with the 2n rule of prefetch architectures, but it al-
so allows the column address to be changed on every clock cycle to achieve a high-
speed, fully random access. Precharging one bank while accessing one of the other
three banks will hide the PRECHARGE cycles and provide seamless, high-speed, ran-
dom-access operation.
The 64Mb SDRAM is designed to operate in 3.3V memory systems. An auto refresh
mode is provided, along with a power-saving, power-down mode. All inputs and out-
puts are LVTTL-compatible.
SDRAM devices offer substantial advances in DRAM operating performance, including
the ability to synchronously burst data at a high data rate with automatic column-ad-
dress generation, the ability to interleave between internal banks to hide precharge
time, and the capability to randomly change column addresses on each clock cycle dur-
ing a burst access.
Automotive Temperature
The automotive temperature (AT) option adheres to the following specifications:
• 16ms refresh rate
• Self refresh not supported
• Ambient and case temperature cannot be less than –40°C or greater than +105°C
PDF: 09005aef80725c0b
64mb_x4x8x16_sdram.pdf - Rev. U 05/13 EN
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