YMF781 Просмотр технического описания (PDF) - Yamaha Corporation

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YMF781

APL-1 Automobile sound PLayer-1

Yamaha Corporation 

YMF781

・Asynchronous Serial Interface （UART）

Ｉtem

Symbol Ｍin. Ｔyp. Ｍax. Ｕnit

Transfer Frequency (Baud rate: fixed to x16) 1 / TRXD

9

RXD allowable frequency error (*1)

-2

144

kHz

+2

%

Conditions: TOP= -40 to 85℃, VDD= 3.0 to 3.6V, VDDC= 3.0 to 3.6V or 4.75 to 5.25V, Capacitor load=50pF

(*1) In the case of 10 bits including the start bit and the stop bit.

・External Memory Interface

Ｉtem

Symbol Ｍin. Ｔyp. Ｍax. Ｕnit

Data (D) Set-up time

TDS

10

ns

Data (D) Hold time

TDH

10

ns

Address (A) Output Delay time

TAD

40

ns

Control Signal Output Delay time (*1)

TCTLD

40

ns

Data (D) Output Delay time

TDD

80

ns

Data (D) Output turn-on time

TDT

20

ns

Conditions: TOP= -40 to 85℃, VDD= 3.0 to 3.6V, VDDC= 3.0 to 3.6V or 4.75 to 5.25V, Capacitor load=50pF

(*1) LBN/LWRN, UBN/UWRN, WRN, RDN, and CS*N

Internal Master Clock

MCK

A[21:0]

D[15:00]

(Output)

D[15:00]

(Input)

LWRN, UWRN,

WRN（3clock or less）

LWRN, UWRN,

WRN（4clock or more）

LBN, UBN,

CS*N, RDN

TAD

TDD

TDT

TCTLD

TCTLD

TCTLD

TAD

TDD

TDS

TDH

TCTLD

TCTLD

TCTLD

Access time 2 to 9 clocks (variable)

※Note that the output timing of LWRN, UWRN, and WRN differs in the access time of 3 clocks or less and that of 4 clocks or more.

10

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