Zakładka z wyszukiwarką danych komponentów |
|
SM320VC5409GGU10EP Arkusz danych(PDF) 8 Page - Texas Instruments |
|
SM320VC5409GGU10EP Arkusz danych(HTML) 8 Page - Texas Instruments |
8 / 78 page SM320VC5409EP FIXEDPOINT DIGITAL SIGNAL PROCESSOR SGUS046 − JULY 2003 8 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 Terminal Functions (Continued) TERMINAL NAME DESCRIPTION I/O† INTERNAL TERMINAL NAME DESCRIPTION I/O† PIN STATE HOST-PORT INTERFACE SIGNALS SECONDARY PRIMARY HA15 − HA0 Bus holders available I/O/Z A15 − A0 O/Z These pins can be used to address internal memory via the HPI when the HPI16 pin is high. The sixteen address pins, A15 to A0, are multiplexed to transfer address between the core CPU and external data/program memory, I/O devices, or HPI in 16-bit mode. The address bus includes bus holders to reduce the static power dissipation caused by floating, unused pins. The bus holders also eliminate the need for external bias resistors on unused pins. When the address bus is not being driven by the ’5409, the bus holders keep the pins at the logic level that was most recently driven. The address bus holders of the ’5409 are disabled at reset, and can be enabled/disabled via the HBH bit of the BSCR. HD15 − HD0 Bus holders available I/O/Z D15 − D0 O/Z These pins can be used to read/write internal memory via the HPI when the HPI16 pin is high. The sixteen data pins, D15 to D0, are multiplexed to transfer data between the core CPU and external data/program memory, I/O devices, or HPI in 16-bit mode. The data bus is placed in the high-impedance state when not outputting or when RS or HOLD is asserted. The data bus also goes into the high-impedance state when OFF is low. The data bus includes bus holders to reduce the static power dissipation caused by floating, unused pins. The bus holders also eliminate the need for external bias resistors on unused pins. When the data bus is not being driven by the ’5409, the bus holders keep the pins at the logic level that was most recently driven. The data bus holders of the ’5409 are disabled at reset, and can be enabled/disabled via the BH bit of the BSCR. HD7 – HD0 Bus holders available I/O/Z Parallel bidirectional data bus. When the HPI is disabled or when the HPI16 pin is high, these pins can also be used as general-purpose I/O pins. HD7–HD0 are placed in the high-impedance state when not outputting data or when OFF is low. The HPI data bus includes bus holders to reduce the static power dissipation caused by floating, unused pins. When the HPI data bus is not being driven by the ’5409, the bus holders keep the pins at the logic level that was most recently driven. The HPI data bus holders are disabled at reset. In 8-bit mode the bus holders can be enabled/disabled via the HBH bit of the BSCR. In 16-bit mode the bus holders are always active on the HD7–HD0 pins. HCNTL0 HCNTL1 Pullup resistor I Control. HCNTL0 and HCNTL1 select a host access to one of the three HPI registers. The control inputs have internal pullup resistors that are only enabled when HPIENA = 0. HBIL Pullup resistor I Byte identification. HBIL identifies the first or second byte of transfer. The HBIL input has an internal pullup resistor that is only enabled when HPIENA = 0. HCS Schmitt trigger/pullup resistor I Chip select. HCS is the select input for the HPI and must be driven low during accesses. The chip-select input has an internal pullup resistor that is only enabled when HPIENA = 0. HDS1 HDS2 Schmitt trigger/pullup resistor I Data strobe. HDS1 and HDS2 are driven by the host read and write strobes to control transfers. The strobe inputs have internal pullup resistors that are only enabled when HPIENA = 0. HAS Schmitt trigger/pullup resistor I Address strobe. Hosts with multiplexed address and data pins require HAS to latch the address in the HPIA register. HAS has an internal pullup resistor that is only enabled when HPIENA = 0. † I = Input, O = Output, Z = High-impedance, S = Supply |
Podobny numer części - SM320VC5409GGU10EP |
|
Podobny opis - SM320VC5409GGU10EP |
|
|
Link URL |
Polityka prywatności |
ALLDATASHEET.PL |
Czy Alldatasheet okazała się pomocna? [ DONATE ] |
O Alldatasheet | Reklama | Kontakt | Polityka prywatności | Linki | Lista producentów 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 |