AMD AMD-K6-2/500AFX Data Sheet - Page 114
BRDY# (Burst Ready), Input, Internal Pullup
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AMD-K6®-2 Processor Data Sheet Preliminary Information 21850J/0-February 2000 4.12 Summary Sampled BRDY# (Burst Ready) Input, Internal Pullup BRDY# is asserted to the processor by system logic to indicate either that the data bus is being driven with valid data during a read cycle or that the data bus has been latched during a write cycle. If necessary, the system logic can insert bus cycle wait states by negating BRDY# until it is ready to continue the data transfer. BRDY # is also used to indicate the completion of special bus cycles. BRDY# is sampled every clock edge within a bus cycle starting with the clock edge after the clock edge that negates ADS #. BRDY# is ignored while the bus is idle. The processor samples the following inputs on the clock edge on which BRDY # is sampled asserted: D[63:0], DP[7:0], and KEN # during read cycles, EWBE # during write cycles (if not masked off), and WB/WT # during read and write cycles. If NA # is sampled asserted prior to BRDY#, then KEN# and WB/WT# are sampled on the clock edge on which NA# is sampled asserted. The number of times the processor expects to sample BRDY # asserted depends on the type of bus cycle, as follows: s One time for a single-transfer cycle, a special bus cycle, or each of two cycles in an interrupt acknowledge sequence s Four times for a burst cycle (once for each data transfer) BRDY # can be held asserted for four consecutive clocks throughout the four transfers of the burst, or it can be negated to insert wait states. 94 Signal Descriptions Chapter 4