Datasheet.kr   

54SXxx 데이터시트 PDF




Actel에서 제조한 전자 부품 54SXxx은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


PDF 형식의 54SXxx 자료 제공

부품번호 54SXxx 기능
기능 General Purpose SDRAM Controller
제조업체 Actel
로고 Actel 로고


54SXxx 데이터시트 를 다운로드하여 반도체의 전기적 특성과 매개변수에 대해 알아보세요.



전체 5 페이지수

미리보기를 사용할 수 없습니다

54SXxx 데이터시트, 핀배열, 회로
v2.0
General-Purpose SDRAM Controller
SDRAM Controller Functional
Description
The general-purpose SDRAM controller is designed to
provide simplified control of many different sizes of
SDRAMs. The controller architecture provides control for
data bursts by linearly incrementing the address. The user
starts a burst at a specified address and the burst continues
until the user terminates it.
SDRAM Controller Signals
The SDRAM controller communicates with a user’s
functions and drives the control signals into the
SDRAM. When the controller recognizes the start of a write
cycle, the controller prepares the SDRAM to accept data
and then indicates readiness by driving the WR_BE_RDY
signal. When the controller recognizes the start of a read
cycle, the controller prepares the SDRAM to provide data
and then indicates readiness by driving the RD_BE_RDY
signal.
The WR_BE_RDY and RD_BE_RDY signals are one-stage
pipelined. On write cycles, the WR_BE_RDY signal is
asserted one clock cycle prior to the time when data can
actually be accepted by the SDRAM. On read cycles, the
RD_BE_RDY signal is asserted one clock cycle prior to the
time when SDRAM data is valid. In general, the *_RDY
signals indicate that the SDRAM and controller will ready
for data transfer on the next cycle.
CLK
RESET_N
ACTIVATE
WR_CYC
ADDR
CYC_DONE
WR_BE_DONE
RD_BE_DONE
RD_BE_RDY
WR_BE_RDY
MADDR
CSn
RASn
CASn
WEn
BA
DQM
CKE
Figure 1 • SDRAM Controller
The user provides a WR_BE_NOW and RD_BE_NOW signal
to the controller. When WR_BE_RDY and WR_BE_NOW
are both asserted at the same time, or when RD_BE_RDY
and RD_BE_NOW are both asserted at the same time, data
is transferred. If the WR_BE_NOW signal is not asserted,
the controller will retain its current address until the
WR_BE_NOW signal asserts at which time data is
transferred. Because of the pipelined nature of the SDRAM
and the assumption that burst addresses are incremented
linearly, a deassertion of RD_BE_NOW causes delay while
the controller backs up and refills the pipeline.
At the conclusion of a cycle, the user asserts the
CYCLE_DONE signal for one cycle.
Table 1 • SDRAM Controller Signals
Name
Description
Inputs from the User’s System
Clk This is the system clock. The controller can transfer data at this rate during bursts.
RESETn
This is a reset signal. Assertion of this signal causes the SDRAM to be initialized.
ACTIVATE
A pulse on this signal causes the Controller to prepare the SDRAM for a cycle.
WR_CYC
This signal defines the type of cycle started when the ACTIVE (ACTIVATE?) signal is asserted.
ADDR(M:0)
This is the beginning address of the burst.
CYC_DONE
This signal causes the cycle to be terminated.
WR_BE_NOW
This signal indicates that the user wants the currently valid data to be written.
RD_BE_NOW
This signal indicates that the user will accept the data on this cycle.
Outputs to the User’s System
February 2000
© 2000 Actel Corporation
1




54SXxx pdf, 반도체, 판매, 대치품
Timing and Utilization
The SDRAM controller will function at over 100 Mhz when
synthesized into SX 3 silicon. Table 2 and Table 3 are
some tables for several parts. Other more-specific timing
information can be derived by using the DirecTime analysis
tools or by looking at the .adf file in the SDRAM controller
files.
Table 2
Seq Comb
Part Tsu Treg-reg Tco count count
54SX08A-3 6.3
6.9
5.7
90/256 204/512
34% 40%
54SX08-std 9.5 10.5 9.0 90
211
Table 3
Tsu
ACTIVATE
WR_CYC
AD
CYC_DONE
WR_BE_NOW
RD_BE_NOW
CS0N
CS1N
RASN
CASN
WEN
MADDR
DQM
WR_BE_RDY
RD_BE_RDY
SX-3
5.2
6.4
2.8
6.3
4.8
5.9
3.3
4.0
2.8
2.8
3.0
5.6
4.5
5.7
5.6
4

4페이지












구       성 총 5 페이지수
다운로드[ 54SXxx.PDF 데이터시트 ]

당사 플랫폼은 키워드, 제품 이름 또는 부품 번호를 사용하여 검색할 수 있는

포괄적인 데이터시트를 제공합니다.


구매 문의
일반 IC 문의 : 샘플 및 소량 구매
-----------------------------------------------------------------------

IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한
광범위한 전력 반도체를 판매합니다.

전력 반도체 전문업체

상호 : 아이지 인터내셔날

사이트 방문 :     [ 홈페이지 ]     [ 블로그 1 ]     [ 블로그 2 ]



관련 데이터시트

부품번호상세설명 및 기능제조사
54SXxx

FPGAs

Actel
Actel
54SXxx

General Purpose SDRAM Controller

Actel
Actel

DataSheet.kr       |      2020   |     연락처      |     링크모음      |      검색     |      사이트맵