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M58WT032KB Datasheet(PDF) 42 Page - Numonyx B.V |
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M58WT032KB Datasheet(HTML) 42 Page - Numonyx B.V |
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42 / 117 page  Configuration Register M58WTxxxKT, M58WTxxxKB 42/117 8.4 Data output configuration bit (CR9) The data output configuration bit determines whether the output remains valid for one or two clock cycles. When the data output configuration bit is ’0’ the output data is valid for one clock cycle. When the data output configuration bit is ’1’ the output data is valid for two clock cycles. The data output configuration depends on the condition: tK > tKQV + tQVK_CPU where tK is the clock period, tQVK_CPU is the data setup time required by the system CPU and tKQV is the clock to data valid time. If this condition is not satisfied, the data output configuration bit should be set to ‘1’ (two clock cycles). Refer to Figure 6: X latency and data output configuration example. 8.5 Wait configuration bit (CR8) In burst mode the Wait bit controls the timing of the Wait output pin, WAIT. When WAIT is asserted, data is not valid and when WAIT is de-asserted, data is valid. When the Wait bit is ’0’ the Wait output pin is asserted during the wait state. When the Wait bit is ’1’ the Wait output pin is asserted one clock cycle before the wait state. 8.6 Burst type bit (CR7) The burst type bit configures the sequence of addresses read as sequential or interleaved. When the burst type bit is ’0’ the memory outputs from interleaved addresses. When the burst type bit is ’1’ the memory outputs from sequential addresses. See Table 12: Burst type definition for the sequence of addresses output from a given starting address in each mode. 8.7 Valid clock edge bit (CR6) The valid clock edge bit, CR6, configures the active edge of the Clock, K, during synchronous burst read operations. When the valid clock edge bit is ’0’ the falling edge of the Clock is the active edge. When the Valid Clock Edge bit is ’1’ the rising edge of the Clock is active. 8.8 Wrap burst bit (CR3) The burst reads can be confined inside the 4 or 8-word boundary (wrap) or overcome the boundary (no wrap). The wrap burst bit selects between wrap and no wrap. When the wrap burst bit is set to ‘0’ the burst read wraps; when it is set to ‘1’ the burst read does not wrap. |
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