AMD K5 Manuale Utente Scaricare il pdf (Pagina 49)

100

18522F/0—Jan1997 AMD-K5 Processor Data Sheet

PRELIMINARY INFORMATION

Single Transfer

Cycles

Single transfer cycles are initiated with the assertion of ADS

while negating the cache signal. The cycle is completed when

the BRDY signal is asserted by the external system. A single

transfer cycle requires a minimum of two external clock cycles.

Timing for a single write transfer cycle is illustrated in Figure

5. (See Figures 28, 29, 30, and 31 beginning on page 74.)

Figure 5. Single Writes (Zero Wait States)

Burst Read Cycles The size of a burst read access is always 32 bytes sent as four

64-bit transfers. A burst read access is indicated by the asser-

tion of the CACHE signal, but if the external memory system

subsequently does not assert KEN, the access will be converted

to a single access. Data is sampled during the same clock that

BRDY is asserted. Wait states can be added by negating BRDY.

The initial address and the byte enables are not changed after

the initial access of a burst. External hardware must be config-

ured to determine the subsequent addresses of the burst in

accordance with the ordering specified in Table 11. PCHK is

driven two clocks following an associated data transfer to the

processor to indicate a data parity error. (See Figure 31 on

page 75 and Figure 32 on page 76.)

Burst Write Cycles Like a burst read access, a burst write access is indicated by

the assertion of the CACHE pin. Burst write cycles (an exam-

ple of which is given in Figure 6) only occur for writebacks of

modified lines in the processor data cache. These transfers are

always four accesses. The address order for writeback cycles is

always 0, 8, 10, 18. All other accesses, including unaligned

accesses that cross 64-bit aligned boundaries, are sent as single

accesses or a series of single accesses. Negating BRDY until

CLK

ADS

BRDY

Data

Add/

W/R

Control

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 99 100

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AMD K5 Manuale Utente Pagina 49

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