 |
Datenblatt-Suchmaschine für elektronische Bauteile |
|
|
Datenblatt-Suchmaschine für elektronische Bauteile |
|
SM55161A-70GBI Datenblatt(PDF) 6 Page - Austin Semiconductor |
|
||||||||||||||||||||||||||||||
SM55161A-70GBI Datenblatt(HTML) 6 Page - Austin Semiconductor |
|
|
6 / 64 page  VRAM SM55161A Production Austin Semiconductor, Inc. AustinSemiconductor,Inc.reservestherighttochangeproductsorspecificationswithoutnotice. 6 SMJ55161A Rev. 1.6 03/05 TABLE 2: PIN DESCRIPTIONS VS. OPERATIONAL MODE PIN DRAM TRANSFER SAM A0-A8 Row, column address Row address, Tap point CASL\, CASU\ Column-address strobe, DQ output enable Tap-address strobe DQ DRAM data I/O, write mask Block-write enable Write-mask-register load enable Color-register load enable CBR (option reset) RAS\ Row-address strobe Row-address strobe SC Serial clock SQ Serial-data output TRG\ DQ output enable Transfer enable WE\ Write enable, write-pre-bit enable QSF Special-function output Serial-register status NC/GND Either make no external connection or tie to system GND (VSS) VCC 1 5V supply VSS 1 Ground SQ output enable, QSF output enable DSF Split-register-transfer enable SE\ NOTES: 1. For proper device operation, all VCC pins must be connected to a 5-V supply, and all VSS pins must be tied to ground. address (A0–A8) Eighteen address bits are required to decode each one of the 262 144 storage cell locations. Nine row-address bits are set up on pins A0–A8 and latched onto the chip on the falling edge of RAS\. Nine column-address bits are set up on pins A0–A8 and latched onto the chip on the first falling edge of CASx\. All addresses must be stable on or before the falling edge of RAS\ and the first falling edge of CASx\. During the full-register-transfer read operation, the states of A0–A8 are latched on the falling edge of RAS\ to select one of the 512 rows where the transfer occurs. At the first falling edge of CASx\, the column-address bits A0–A8 are latched. The most significant column-address bit (A8) selects which half of the row is transferred to the SAM. The appropriate 8-bit column address (A0–A8) selects one of 512 tap points (starting positions) for the serial-data output. During the split-register-transfer read operation, an internal counter selects which half of the register is used. If the high half of the SAM is currently in use, the low half of the SAM is loaded with the low half of the DRAM half row and vice versa. Column address (A8) selects the DRAM half row. The remaining eight address bits (A0–A7) are used to select one of 256 possible starting locations within the SAM. row-address strobe (RAS\) RAS\ is similar to a chip enable so that all DRAM cycles and transfer cycles are initiated by the falling edge of RAS\. RAS\ is a control input that latches the states of the row address, WE\, TRG\, CASL\, CASU\, and DSF onto the chip to invoke DRAM and transfer-read/write functions of the SMJ55161A. column-address strobe (CASL, CASU) CASL\ and CASU\ are control inputs that latch the states of the column address and DSF to control DRAM and transfer functions of the SMJ55161A. CASx\ also acts as output enable for the DRAM output pins DQ0–DQ15. In DRAM operation, CASL\ enables data to be written to or read from the lower byte (DQ0–DQ7), and CASU\ enables data to be written to or from the upper byte (DQ8–DQ15). In transfer operations, address bits A0–A8 are latched at the first falling edge of CASx\ as the start position (tap) for the serial-data output (SQ0–SQ15). |
Ähnliche Teilenummer - SM55161A-70GBI |
|
Ähnliche Beschreibung - SM55161A-70GBI |
|
|
Link URL |
| Privatsphäre und Datenschutz |
| ALLDATASHEETDE.COM |
| War ALLDATASHEET hilfreich? [ DONATE ] |
Über Alldatasheet | Werbung | Kontakt | Privatsphäre und Datenschutz | Linktausch | Hersteller 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 |
German ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
