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DP83266VF Datasheet(PDF) 38 Page - National Semiconductor (TI) |
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DP83266VF Datasheet(HTML) 38 Page - National Semiconductor (TI) |
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38 / 152 page  60 Functional Description (Service Engine) (Continued) TLF11705 – 12 FIGURE 6-7 ABus Burst Write Physical Addressing16 Bytes 1 ws 644 Virtual Addressing Bus Transactions Single 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 Tva within the next three clocks and then drives AB A and AB AD Tva MACSI device drives AB A and AB AD with the vir- tual address for one clock negates AB AS asserts AB RW drives AB SIZ 20 and negates AB BR if an- other transaction is not required Tmmu Host MMU performs an address translation during this clock Tpa Host MMU drives AB AD with the translated (physi- cal) address Td MACSI device negates AB AS asserts AB DEN and samples AB ACK and AB ERR Slave asserts AB ACK drives AB ERR and drives AB AD (with data) when ready MACSI device samples a valid AB ACK and cap- tures the read data Tw states may occur after Td 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 Single 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 Tva within the next three clocks and then drives AB A and AB AD Tva MACSI device drives AB A and AB AD with the vir- tual address for one clock negates AB AS negates AB RW and drives AB SIZ 20 38 |
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