DP83266VF National Semiconductor, DP83266VF Datasheet - Page 37

• Manufacturer Part Number: DP83266VF
• Description: IC MEDIA ACSS CTRL INTF 160PQFP
• Manufacturer: National Semiconductor

Specifications of DP83266VF

• Applications: *
• Voltage - Supply: 4.75 V ~ 5.25 V
• Package / Case: 160-BFQFP
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Interface: -
• Other names: *DP83266VF

6 0 Functional Description (Service Engine)
Burst Read
Tbr MACSI device asserts AB BR to indicate it wishes to
perform a transfer Host asserts AB BG The MACSI de-
vice moves to Tpa within the next three clocks
Tpa MACSI device drives AB A and AB AD with the ad-
dress asserts AB AS drives AB R W and AB SIZ 2 0
and negates AB BR if another transaction is not required
Td MACSI device asserts AB DEN samples AB ACK
and AB ERR and increments the address on AB A
Slave asserts AB ACK drives AB ERR and drives
AB AD (with data) when ready MACSI device samples a
valid AB ACK to capture the read data Tw states may
occur after Td Td state is repeated four or eight times (ac-
cording to the burst size) If SIMR1 ASM
device negates AB AS in the last Td cycle If SIMR1 ASM
cycle
Tr MACSI device negates AB R W AB DEN and
AB SIZ 2 0
deasserts AB ACK and AB ERR and releases AB AD
e
1 the MACSI device will negate AB AS in the first Td
and releases AB A and AB AS Slave
FIGURE 6-6 ABus Burst Read Physical Addressing 16 Bytes 1 w s
e
0 the MACSI
37
Burst Write
Tbr MACSI device asserts AB BR to indicate it wishes to
perform a transfer Host asserts AB BG The MACSI de-
vice moves to Tpa within the next three clocks
Tpa MACSI device drives AB A and AB AD with the ad-
dress asserts AB AS drives AB R W and AB SIZ 2 0
and negates AB BR if another transaction is not required
Td MACSI device asserts AB DEN drives AB AD with
the write data samples AB ACK and AB ERR and incre-
ments the address on AB A Slave captures AB AD data
asserts AB ACK drives AB ERR MACSI device samples
a valid AB ACK Tw states may occur after Td Td state is
repeated as required for the complete burst If SIMR1 ASM
cle If SIMR1 ASM
AB AS in the first Td cycle
Tr MACSI device negates AB R W AB DEN and
AB SIZ 2 0 releases AB A and AB AS and stops driv-
ing AB AD with data Slave deasserts AB ACK and
AB ERR
e
0 the MACSI device negates AB AS in the last Td cy-
(Continued)
e
1 the MACSI device will negate
TL F 11705 – 11