MU9C2480A(1998) Ver la hoja de datos (PDF) - Music Semiconductors

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MU9C2480A
(Rev.:1998)

LANCAMs®

Music Semiconductors 

OPERATIONAL CHARACTERISTICS Continued

/E

MU9C2480A/L

/W

/CM

/EC

DQ 1 5 -0

/E

DA TA OU T

Figure 3: Read Cycle

/W

/CM

/EC

D Q 15–0

Figure 4: Write Cycle

COM PAR AND W RIT E

STA TU S R EAD

AS S O C IAT E D D ATA

C YC L E

C YC L E

R EA D C YCL E

/E

/CM

/W

DQ 1 5 – 0

/EC

/M F

/M A, /M M

DA TA

DA TA

DA TA

MAT CH FLAG VALID

/M A A ND / M M FL AG S UP D AT ED

Figure 5: Cycle to Cycle Timing Example

Automatic compares perform a compare of the contents of the

Comparand register against Memory locations that are tagged

as “Valid,” and occur whenever the following happens:

Ø The Destination Segment counter in the Segment

Control register reaches its end limit during writes to

the Comparand or mask registers.

Ø After a command write of a TCO CT is executed (except

for a software reset), so that a compare is executed

with the new settings of the Control register.

Forced compares are initiated by CMP instructions

using one of the four validity conditions: V, R, S, and E. The

forced compare against “Empty” locations automatically

masks all 64 bits of data to find all locations with the validity

bits set to “Empty,” while the other forced compares are

only masked as selected in the Control register.

VERTICAL CASCADING

LANCAMs can be vertically cascaded to increase system

depth. Through the use of flag daisy-chaining, multiple

devices will respond as an integrated system. The flag

daisy chain allows all commands to be issued globally,

with a response only in the device containing the Highest-

13

Rev. 1a

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