5.6.3.2 Ultra DMA data burst timing requirements

Table 5.16 Ultra DMA data burst timing requirements (1 of 2)

NAME

MODE 0

MODE 1

MODE 2

COMMENT

 

(in ns)

(in ns)

(in ns)

 

 

 

 

 

 

 

 

 

 

MIN

MAX

MIN

MAX

MIN

MAX

 

 

 

 

 

 

 

 

 

tCYC

114

 

75

 

55

 

Cycle time (from STROBE edge to

 

 

 

 

 

 

 

STROBE edge)

 

 

 

 

 

 

 

 

t2CYC

235

 

156

 

117

 

Two cycle time (from rising edge to next

 

 

 

 

 

 

 

rising edge or from falling edge to next

 

 

 

 

 

 

 

falling edge of STROBE)

 

 

 

 

 

 

 

 

tDS

15

 

10

 

7

 

Data setup time (at recipient)

tDH

5

 

5

 

5

 

Data hold time (at recipient)

tDVS

70

 

48

 

34

 

Data valid setup time at sender (from data

 

 

 

 

 

 

 

bus being valid until STROBE edge)

 

 

 

 

 

 

 

 

tDVH

6

 

6

 

6

 

Data valid hold time at sender (from

 

 

 

 

 

 

 

STROBE edge until data may become

 

 

 

 

 

 

 

invalid)

 

 

 

 

 

 

 

 

tFS

0

230

0

200

0

170

First STROBE time (for device to first

 

 

 

 

 

 

 

negate DSTROBE from STOP during a

 

 

 

 

 

 

 

data in burst)

 

 

 

 

 

 

 

 

tLI

0

150

0

150

0

150

Limited interlock time (see Note 1)

tMLI

20

 

20

 

20

 

Interlock time with minimum (see Note 1)

tUI

0

 

0

 

0

 

Unlimited interlock time (see Note 1)

tAZ

 

10

 

10

 

10

Maximum time allowed for output drivers

 

 

 

 

 

 

 

to release (from being asserted or negated)

tZAH

20

 

20

 

20

 

Minimum delay time required for output

tZAD

0

 

0

 

0

 

drivers to assert or negate (from released

 

 

 

 

 

 

 

state)

 

 

 

 

 

 

 

 

tENV

20

70

20

70

20

70

Envelope time (from DMACK- to STOP

 

 

 

 

 

 

 

and HDMARDY- during data in burst

 

 

 

 

 

 

 

initiation and from DMACK to STOP

 

 

 

 

 

 

 

during data out burst initiation)

 

 

 

 

 

 

 

 

tSR

 

50

 

30

 

20

STROBE-to-DMARDY-time (if DMARDY-

 

 

 

 

 

 

 

is negated before this long after STROBE

 

 

 

 

 

 

 

edge, the recipient shall receive no more than

 

 

 

 

 

 

 

one additional data word)

 

 

 

 

 

 

 

 

tRFS

 

75

 

60

 

50

Ready-to-final-STROBE time (no STROBE

 

 

 

 

 

 

 

edges shall be sent this long after negation

 

 

 

 

 

 

 

of DMARDY)

 

 

 

 

 

 

 

 

tRP

160

 

125

 

100

 

Ready-to-pause time (that recipient shall

 

 

 

 

 

 

 

wait to initiate pause after negating

 

 

 

 

 

 

 

DMARDY-)

 

 

 

 

 

 

 

 

C141-E056-01EN

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Fujitsu MPC3065AH, MPC3045AH manual Name Mode Comment MIN MAX, Dmardy