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TMPR4925 Datasheet(PDF) 119 Page - Toshiba Semiconductor |
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TMPR4925 Datasheet(HTML) 119 Page - Toshiba Semiconductor |
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119 / 590 page  Chapter 7 External Bus Controller 7-9 7.3.6 Access Modes The following four modes are available as controller access modes. These modes can be set separately for each channel. • Normal mode • Page mode • External ACK mode • Ready mode Depending on the combination of modes in each channel, either of two modes in which the ACK*/Ready signal operates differently (ACK*/Ready Dynamic mode, ACK*/Ready Static mode) is selected by the ACK*/Ready Mode bit (PCFG.ACKIN) of the Chip Configuration Register. The mode selected is applied globally to all channels. (1) ACK*/READY Dynamic mode (PCFG.ACKIN = 0) This mode is selected in the initial state. The ACK*/Ready signal automatically switches to either input or output according to the setting of each channel. When in the Normal mode or the Page mode, the ACK*/Ready signal is an output signal, and the internally generated ACK* signal is output. When in the External ACK* or Ready mode, the ACK*/Ready signal becomes an input signal. The ACK*/Ready signal outputs High if there is no access to the External Bus Controller. However, this signal may output Low during access to SDRAM. Please refer to the timing diagrams (Figure 7.5.23 and Figure 7.5.24) and be careful to avoid conflicts when switching from output to input. (2) ACK*/Ready Static mode (PCFG.ACKIN = 1) The internally generated ACK* signal is not output when in either the Normal mode or Page mode. Therefore, the ACK*/Ready signal will not become an output in any channel. Access using Burst transfer by the internal bus (G-Bus) is supported when in a mode other than the Ready mode. However, the Ready mode is not supported. Table 7.3.7 Operation Mode PM RDY EACK Mode ACK*/READY Pin State Access End Timing State G-Bus Burst Access 0Normal Output Internally Generated ACK* √ 0 1 External ACK* Input ACK* Input √ 0 1 READY Input Ready Input 0 Page Output Internally Generated ACK* √ ACK*/Ready Dynamic Mode !0 1 Reserved 0Normal Hi-Z Internally Generated ACK* √ 0 1 External ACK* Input ACK* Input √ 0 1 READY Input Ready Input 0 Page Hi-Z Internally Generated ACK* √ ACK*/Ready Static Mode !0 1 Reserved |
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