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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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S29CD032G0JQAI112 데이터시트(PDF) 35 Page - SPANSION |
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S29CD032G0JQAI112 데이터시트(HTML) 35 Page - SPANSION |
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35 / 87 page  November 14, 2005 S29CD-G_00_B0 S29CD-G Flash Family 33 Pr el im i n a r y Initial Access Delay Configuration The frequency configuration informs the device of the number of clocks that must elapse after ADV# is driven active before data is available. This value is determined by the input clock frequency. Sector Protection The device features several levels of sector protection, which can disable both the program and erase operations in certain sectors or sector groups Sector and Sector Groups The distinction between sectors and sector groups is fundamental to sector protection. Sector are individual sectors that can be individually sector protected/unprotected. These are the outermost 4 Kword boot sectors, that is, SA0 to SA7 and SA70 to SA77. See Table 35 on page 35, Table 23 on page 19, Table 24 on page 20, Table 25 on page 21, and Table 26 on page 22. Sector groups are a collection of three or four adjacent 32 kword sectors. For example, sector group SG8 is comprised of sector SA8 to SA10. When any sector in a sector group is protected/ unprotected, every sector in that group is protection/unprotected. See Table 35, Table 23, Table 24, Table 25, and Table 26. Persistent Sector Protection A command sector protection method that replaces the old 12 V controlled protection method. Password Sector Protection A highly sophisticated protection method that requires a password before changes to certain sec- tors or sector groups are permitted. WP# Hardware Protection A write protect pin that can prevent program or erase to the two outermost 8 Kbytes sectors in the 75% bank. All parts default to operate in the Persistent Sector Protection mode. The customer must then choose if the Persistent or Password Protection method is most desirable. There are two one-time programmable non-volatile bits that define which sector protection method is used. If the cus- tomer decides to continue using the Persistent Sector Protection method, they must set the Persistent Sector Protection Mode Locking Bit. This permanently sets the part to operate only using Persistent Sector Protection. If the customer decides to use the password method, they must set the Password Mode Locking Bit. This permanently sets the part to operate only using password sector protection. It is important to remember that setting either the Persistent Sector Protection Mode Lock- ing Bit or the Password Mode Locking Bit permanently selects the protection mode. It is not possible to switch between the two methods once a locking bit is set. It is important that one mode is explicitly selected when the device is first programmed, rather than relying on Table 34. Configuration Register After Device Reset CR15 CR14 CR13 CR12 CR11 CR10 CR9 CR8 RM Reserve IAD3 IAD2 IAD1 IAD0 DOC WC 1 0 0 1 1 1 0 0 CR7 CR6 CR5 CR4 CR3 CR2 CR1 CR0 BS CC Reserve Reserve Reserve BL2 BL1 BL0 1 1 0 0 0 1 0 0 |
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