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SH7616 Datasheet(PDF) 345 Page - Renesas Technology Corp |
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SH7616 Datasheet(HTML) 345 Page - Renesas Technology Corp |
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345 / 935 page  Section 7 Bus State Controller (BSC) Rev. 2.00 Mar 09, 2006 page 319 of 906 REJ09B0292-0200 Refresh Requests and Bus Cycle Requests: When a refresh request occurs while a bus cycle is executing, the refresh will not be executed until the bus cycle is completed. When a refresh request occurs while the bus is released using the bus arbitration function, the refresh will not be executed until the bus is recaptured. In the SH7616, the REFOUT pin is provided to send a signal requesting the bus right during the wait for refreshing to be executed. REFOUT is asserted until the bus is acquired. If RTCNT and RTCOR match and a new refresh request occurs while waiting for the refresh to execute, the previous refresh request is erased. To make sure the refresh executes properly, be sure that the bus cycle and bus capture do not exceed the refresh interval. If a bus arbitration request occurs during a self-refresh, the bus is not released until the self-refresh is cleared. Tp CKIO CKE A10 CS2 or CS3 RAS CAS RD/ WR DQMxx Trr Trc Trc Trc Trc Trc Tre Figure 7.34 Self-Refresh Timing |
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