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SH7708 Datasheet(PDF) 82 Page - Renesas Technology Corp |
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SH7708 Datasheet(HTML) 82 Page - Renesas Technology Corp |
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82 / 633 page  64 The sharing information (SH) determines whether the PTEH.ASID and the ASID in the TLB entry are compared. ASIDs are compared when there is no sharing between processes (SH = 0) but not when there is sharing (SH = 1). When single virtual memory is supported (MMUCR.SV = 1) and privileged mode is engaged (SR.MD = 1), all process resources can be accessed. This means that ASIDs are not compared when single virtual memory is supported and privileged mode is engaged. The objects of address comparison are shown in figure 3.8. Bits compared: VPN (31–17) VPN (11–10) SZ = 0? Yes No Yes (1 kbyte) No (4 kbytes) Bits compared: VPN (31–17) Bits compared: VPN (31–17) VPN (11–10) ASID (7–0) SZ = 0? Yes (1 kbyte) No (4 kbytes) Bits compared: VPN (31–17) ASID (7–0) SH = 1 or (SR.MD = 1 and MMUCR.SV = 1)? Figure 3.8 Objects of Address Comparison |
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