MAC7200 datasheet(218/976 Pages) FREESCALE

218 / 976 page

Nexus Bus Aborts

MAC7200 Microcontroller Family Reference Manual, Rev. 2

140

Freescale Semiconductor

11.5.5

RDY - DMA Ready (Active low output)

This pin indicates to the development tool that a DMA access has completed successfully.

11.5.6

MCKO - Message Clock (Output)

This pin provides the clock reference for all Nexus inputs and outputs.

11.6

Nexus Bus Aborts

The Nexus is not capable of producing any bus aborts. Any Nexus bus accesses that generate aborts are

treated as if the accesses were initiated by the ARM7 core.

11.7

Nexus Differences from MAC71xx

•

Changed from Nexus2p to Nexus3p (Includes data trace)

•

Added four “address match only” breakpoints (pending approval)

•

Added two data watchpoints

•

Changed from two MDO pins to eight MDO pins

•

Number of MSEO pins is no longer hard-coded in the design, but now selectable with the MSC bit

in the Nexus PCR register

11.8

Nexus Application Usage

11.8.1

Nexus Configuration

Enabling and selection of the Nexus port is via the value of the Port F0/F1 pins at Reset (See Table 11-12).

On some packages, only one Nexus Port may be available. Once a Nexus Port is enabled and selected, the

Nexus itself must still be enabled. Please refer to the Nexus 3 Block Guide or the Nexus web site

www.ieee-isto.org/Nexus5001 for more information.

On the MAC71xx family, the number of MSEO pins selected was done via an input port on the Nexus

module (ext_mseo_sel) (0 = 1-pin, 1 = 2-pin). For all MAC71xx devices, this was tied to 0, denoting a

single MSEO pin was available. On the MAC72xx, this selection is done via the MSC bit in the Port

Table 11-12. Nexus Configuration

PF0

PF1

Description

Nexus Ports are disabled

(Ports are used for "normal" functionality)

Nexus Primary Port is enabled

Nexus Ports are disabled

(Ports are used for "normal" functionality)

Nexus Secondary Port is enabled

MAC7200 bảng dữ liệu(PDF) 218 Page - Freescale Semiconductor, Inc

MAC7200 bảng dữ liệu(HTML) 218 Page - Freescale Semiconductor, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

bảng dữ liệu tải về

Link URL