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DP83266 Datasheet(PDF) 37 Page - National Semiconductor (TI) |
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DP83266 Datasheet(HTML) 37 Page - National Semiconductor (TI) |
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37 / 152 page  60 Functional Description (Service Engine) (Continued) TLF11705 – 11 FIGURE 6-6 ABus Burst Read Physical Addressing16 Bytes 1 ws 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 RW and AB SIZ 20 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 SIMR1ASM e 0 the MACSI device negates AB AS in the last Td cycle If SIMR1ASM e 1 the MACSI device will negate AB AS in the first Td cycle Tr MACSI device negates AB RW AB DEN and AB SIZ 20 and releases AB A and AB AS Slave deasserts AB ACK and AB ERR and releases AB AD 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 RW and AB SIZ 20 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 SIMR1ASM e 0 the MACSI device negates AB AS in the last Td cy- cle If SIMR1ASMe1 the MACSI device will negate AB AS in the first Td cycle Tr MACSI device negates AB RW AB DEN and AB SIZ 20 releases AB A and AB AS and stops driv- ing AB AD with data Slave deasserts AB ACK and AB ERR 37 |
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