データシートサーチシステム |
|
AD9927 データシート(PDF) 83 Page - Analog Devices |
|
AD9927 データシート(HTML) 83 Page - Analog Devices |
83 / 100 page AD9927 Rev. 0 | Page 83 of 100 LAYOUT OF INTERNAL REGISTERS The AD9927 address space is divided into two register areas, as illustrated in Figure 99. In the first address space, Address 0x00 to Address 0xFF contain the registers for the AFE, miscellaneous, VD/HD, I/O and CP, timing core, shutter and GPO, and update control functions. The second address space, beginning at Address 0x800, consists of the V-pattern groups, V-sequences, and field registers. This is a configurable set of registers; the user can decide how many V-pattern groups, V-sequences, and fields are used in a particular design. Therefore, the addresses for these registers vary, depending on the number of V-patterns and V-sequences chosen. Address 0x28 specifies the total number of V-pattern groups and V-sequences used. The starting address for the V-pattern groups is always 0x800. The starting address for the V-sequences is based on the number of V-pattern groups used, with each V-pattern group occupying 48 register addresses. The starting address for the field registers depends on both the number of V-pattern groups and the number of V-sequences. Each V-sequence occupies 40 register addresses, and each field occupies 16 register addresses. The starting address for the V-sequences is equal to 0x800 plus the number of V-pattern groups times 48. The starting address for the fields is equal to the starting address of the V-sequences plus the number of V-sequences times 40. The V-pattern, V-sequence, and field registers must always occupy a continuous block of addresses. Figure 100 shows an example in which three V-pattern groups, four V-sequences, and two fields are used. The starting address for the V-pattern groups is always 0x800. Since VPATNUM = 3, the V-pattern groups occupies 144 address locations. The start of the V-sequence registers is 0x890 (that is, 0x800 + 144). With VSEQNUM = 4, the V-sequences occupy 160 address locations. Therefore, the field registers begin at 0x930 (that is, 0x890 + 160). The AD9927 address space contains many unused addresses. Undefined addresses between Address 0x00 and Address 0xFF should not be written to; otherwise, the AD9927 may operate incorrectly. Continuous register writes should be performed carefully so that undefined registers are not written to. FIXED REGISTER AREA ADDR 0x00 V-PATTERN GROUPS V-SEQUENCES CONFIGURABLE REGISTER AREA VPAT START 0x800 FIELDS MAX 0xFFF VSEQ START FIELD START ADDR 0xFF AFE REGISTERS UPDATE CONTROL REGISTERS MISCELLANEOUS REGISTERS VD/HD REGISTERS I/O AND CP REGISTERS TEST REGISTERS TIMING CORE REGISTERS MODE REGISTERS TEST REGISTERS SHUTTER AND GPO REGISTERS INVALID DO NOT ACCESS Figure 99. Layout of AD9927 Registers ADDR 0x800 ADDR 0x890 ADDR 0x930 ADDR 0x950 MAX 0xFFF 3 V-PATTERN GROUPS (48× 3= 144REGISTERS) 4 V-SEQUENCES (40× 4= 160REGISTERS) 2FIELDS (16× 2= 32 REGISTERS) UNUSED MEMORY Figure 100. Example Register Configuration |
同様の部品番号 - AD9927 |
|
同様の説明 - AD9927 |
|
|
リンク URL |
プライバシーポリシー |
ALLDATASHEET.JP |
ALLDATASHEETはお客様のビジネスに役立ちますか? [ DONATE ] |
Alldatasheetは | 広告 | お問い合わせ | プライバシーポリシー | リンク交換 | メーカーリスト All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |