深圳市尚想信息技术有限公司

The Latency Count bits, LC[2:0], tell the device how many clock cycles must elapse from the rising edge of ADV# (or from the first valid clock edge after ADV# is asserted) until the first data word is to be driven onto DQ[15:0]. The input clock frequency is used to determine this value. Figure 28 shows the data output latency for the different settings of LC[2:0]. Synchronous burst with a Latency Count setting of Code 4 will result in zero WAIT state; however, a Latency Count setting of Code 5 will cause 1 WAIT state (Code 6 will cause 2 WAIT states, and Code 7 will cause 3 WAIT states) after every four words, regardless of whether a 16-word boundary is crossed. If RCR[9] (Data Hold) bit is set (data hold of two clocks) this WAIT condition will not occur because enough clocks elapse during each burst cycle to eliminate subsequent WAIT states.