Electronic Components Datasheet Search |
|
ADSP-2141L Datasheet(PDF) 11 Page - Analog Devices |
|
ADSP-2141L Datasheet(HTML) 11 Page - Analog Devices |
11 / 39 page REV. 0 ADSP-2141L –11– IDMA Mode Multiplex Bus Pin Definition IDMA Port (218x Mode) PIN FUNCTION DESCRIPTIONS—IDMA Mode Multiplex Bus Pin Name IDMA Name Pins I/O Description MPLX5 IRD 1 I IDMA Port Read Input MPLX6 IWR 1 I IDMA Port Write Input MPLX7 IS 1 I IDMA Port Select MPLX8 IAL 1 I IDMA Port Address Latch MPLX9 IACK 1 O IDMA Port Access Ready Acknowledge MPLX10 FL0 1 O Output Flags MPLX11 FL1 1 O Output Flags MPLX12 FL2 1 O Output Flags MPLX_BUS IAD 16 I/O IDMA Data I/O PCI Port PIN FUNCTION DESCRIPTIONS—PCI Mode Multiplex Bus Pin Name PCI Name Pins I/O Description MPLX1 Pci_ cbe3 1 I/O Bus Command / Byte Enable 3 MPLX2 Pci_ cbe2 1 I/O Bus Command / Byte Enable 2 MPLX3 Pci_ cbe1 1 I/O Bus Command / Byte Enable 1 MPLX4 Pci_ cbe0 1 I/O Bus Command / Byte Enable 0 MPLX5 Pci_idsel 1 I Initialization Device Select MPLX6 Pci_ gnt 1 I Bus Grant MPLX7 Pci_ frame 1 I/O Cycle Frame MPLX8 Pci_ devsel 1 I/O Device Select MPLX9 Pci_ trdy 1 I/O Target Ready MPLX10 Pci_ perr 1 I/O Parity Error MPLX11 Pci_ serr 1 I/O System Error MPLX12 Pci_ req 1 O PCI Bus Request MPLX_BUS Pci_ad15:0 Pci_ad31:16 32 I/O PCI Address/Data Bus PF7/ INT_H Pci_ intA 1 O PCI Interrupt A Request SYSTEM INTERFACE The ADSP-2141L may be integrated into a wide variety of sys- tems, including those that already have a microprocessor and those that will use the ADSP-2141L as the main processor. The device can be configured into one of two Host Bus modes: IDMA or PCI. IDMA Bus Mode The IDMA bus mode operates the same as in a native ADSP- 218x device, as described in this section. The IDMA port provides an efficient means of communication between a host system and the ADSP-2141L. The port is used to access the on-chip program memory and data memory of the DSP with only one DSP cycle per word overhead. The IDMA port cannot, however, be used to write to the DSP’s memory- mapped control registers. The IDMA port has a 16-bit multiplexed address and data bus, and supports reading or writing 16-bit data (DM) or 24-bit program memory (PM). The IDMA port is completely asyn- chronous and can be written to while the ADSP-2141L is oper- ating at full speed. The DSP memory address is latched and then automatically incremented after each IDMA transaction. An external device can therefore access a block of sequentially addressed memory by specifying only the starting address of the block. This increases throughput as the address does not have to be sent for each memory access. The IDMA port access occurs in two phases. The first is the IDMA address latch cycle. When the acknowledge is asserted, a 14-bit address and 1-bit destination type can be driven onto the bus by an external device. The address specifies an on-chip memory location; the destination type specifies whether it is a DM or PM access. The falling edge of the address latch signal latches this value to the IDMAA register. Once the address is stored, data can either be read from or written to the ADSP-2141L’s on-chip memory. Asserting the select line ( IS) and the appropriate read or write line (IRD and IWR respectively) signals the ADSP-2141L that a particular transaction is required. In either case, there is a one-processor- cycle delay for synchronization. The memory access consumes an additional processor cycle. Once an access has occurred, the latched address is automati- cally incremented and another access can occur. Through the IDMAA register, the ADSP-2141L can also specify the starting address and data format for DMA operation. Figure 6 illustrates a typical system configuration for the IDMA mode. |
Similar Part No. - ADSP-2141L_15 |
|
Similar Description - ADSP-2141L_15 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List 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 |