COBHAM GR740 User Manual

GR740-UM-DS, Nov 2017, Version 1.7 357 www.cobham.com/gaisler
GR740
30.2.4 PLL reconfiguration interface
Three registers allow the PLLs in the design to be reconfigured. One of them is a read-only register
indicating the current configuration, the other two registers are for specifying the new configuration
and commanding the reprogramming.
When the PLL is reprogrammed, the entire system will be reset and the new configuration will be
reflected in the current configuration register. An extra flag field is included in the configuration
which does not fill any function, this can be used by software to preserve a few bits of information
across the restart.
The relation between configuration words and resulting PLL programming is described in section 4.5.
30.2.5 Lockdown register
These different configuration can be locked to prevent further modification using the lockdown regis-
ter. Locking can be revokable or permanent (until next full system reset). Note that the lockdown reg-
ister is not reset when the PLL is reconfigured but only when the external reset signal is asserted.
Table 452.Groups for pad drive strength control
Group Description Pins
0 SDRAM outgoing clock mem_clk_out
1 SDRAM address/command mem_wen, mem_rasn, mem_cke[1:0], mem_casn, mem_ba,
mem_addr[12:0]
2 SDRAM chip-select mem_sn[1:0], mem_addr[14:13]
3 SDRAM data-mask mem_dqm[11:0]
4 SDRAM data non-muxed mem_dq[79:64, 41, 32:0]
5 SDRAM data / PCI address /
ETH1
mem_dq[95:80, 63:48, 38]
6 SDRAM data / PCI command mem_dq[47:43, 40:39, 37:34]
7 SDRAM data / PCI request mem_dq[42]
8 SDRAM data / PCI inta mem_dq[33]
9 ETH0 eth0_txer, eth0_txd[7:0], eth0_txen
10 PROMIO control non-muxed promio_oen, promio_wen, promio_read, prom_cen[0]
11 PROMIO control / CAN prom_cen[1], io_sn
12 PROMIO address / UART promio_addr[27:26]
13 PROMIO addr / 1553 promio_addr[25:20]
14 PROMIO addr / UART/SPWD promio_addr[19:16]
15 PROMIO address non-muxed promio_addr[15:0]
16 PROMIO data MSB promio_data[15:8]
17 PROMIO data LSB promio_data[7:0]
18 GPIO gpio[15:0]
19 Miscellaneous dsu_active, proc_errorn, eth0_mdio, eth0_mdc, spi_miso, spi_-
mosi, spi_sck, spi_slvsel[1:0], pll_locked[5:0], wdogn, jtag_tdo,
gr1553_busatxin, gr1553_busbtxin

COBHAM GR740 Specifications

General

Brand	COBHAM
Model	GR740
Category	Computer Hardware
Language	English